Someone called with personal details I never shared with them

Plain-language help for ordinary people. General information, not legal advice. Helplines, portals and screen names were checked against official Government and regulator pages on 1 November 2026. Portals change: if a screen looks different, follow the words on the screen and the official guide linked in each step.

A caller from a personal number knows things you only gave to one company: a recent purchase, a policy, a booking, your address. They may really work for that company or one of its partners and be using your data in a way you never agreed to. Or the data leaked and a fraudster has it.

Safety first. Threatened or in danger: call 181 (women) or go to the nearest police station. Lost money: call 1930 at once.

Not legal advice. This page explains the rules in plain words so you can act. Consult a lawyer before you sue anyone or send a legal notice. Laws and portals change; check the linked official source.

Step 1: stay safe and find out who it is

1. Do not share an OTP, PIN, password or card number.
2. Ask for their name, company, role and ID. Write it down.
3. Hang up and call the company on a number you find yourself, on its official website or app.
4. Ask whether this person works for the company or a partner. Ask for a written answer (Letter 1 below).
5. Think about where you gave exactly these details. That company is the one to write to.

If it is genuine: hold the company accountable

Which rules this may break

• SPDI Rules, 2011 and IT Act section 43A for sensitive data.
• IT Act section 72A for disclosure in breach of contract.
• Consumer Protection Act, 2019 for deficiency in service.

What the company must do, and by when

• Answer your written request.
• Stop the misuse.
• From 13 May 2027: tell you who received your data (section 11) and report breaches (section 8(6)).

Letter 1: ask them to confirm who the caller is

Send it through the official channel. Keep a copy and the acknowledgement.

To: The Grievance Officer, [Company name]
Subject: Please confirm whether this person works for you

Dear Sir or Madam,

I am your customer. My customer or account ID: [number].

On [date] at [time] I received a call or message from [phone number]. This is not an official number. The person said they were [name], [role or employee ID], from the company. They knew my [list the details they knew].

Please confirm in writing within 7 days:
1. Whether this person is your employee, agent, vendor, agent or partner.
2. If yes, their name, role and the agency they work for.
3. Whether you allow staff or agents to contact customers from personal numbers.
4. If they are not connected with you, please say so, so I can report the number.

Name:
Registered mobile number:
Date:

Letter 2: ask how your data got there

To: The Grievance Officer, [Company name]
Subject: How did my personal data reach a personal phone? Complaint number [if any]

Dear Sir or Madam,

On [date] a person connected with you, [name if known], contacted me from a personal number [number] and knew my [details]. [Describe what they did.]

Please tell me in writing:
1. What personal data about me this person could see, and through which system or app.
2. Whether you shared my data with any agency, vendor, agent, partner or processor, and their names.
3. How my data reached a personal phone or account outside your official systems.
4. What action you have taken against the person or agency, including suspension while you investigate.
5. What you have done to stop this happening again.

Many companies already name a grievance officer for data matters under the IT Act's 2011 SPDI Rules.

From 13 May 2027, sections 8 and 11 of the Digital Personal Data Protection Act, 2023 also apply.

Please reply within 30 days. If I do not hear from you, I will escalate to the National Consumer Helpline and, from 13 May 2027, the Data Protection Board.

Name:
Registered mobile number:
Date:

Evidence to keep

• Call log, recording and messages.
• A note of what they knew.
• The company's written reply.

More in the evidence checklist.

Can you sue? What realistically happens

• Consumer Commission: the most practical route for compensation. Cheap, no lawyer needed, file within 2 years.
• IT Act section 43A (until 13 May 2027): if the company was negligent with sensitive personal data (passwords, bank or card details, health records, biometrics) and that caused wrongful loss or gain, it must pay compensation. Claims up to Rs 5 crore go to your State's IT Secretary acting as Adjudicating Officer (section 46); larger claims go to a court. Appeal within 45 days (section 57). Your phone number and address alone are not sensitive data under the 2011 Rules.
• Civil suit for damages: possible, but slow and costly. Section 61 of the IT Act bars civil courts from matters the Adjudicating Officer can decide.
• Police: only where there is a crime, for example a person who disclosed your information in breach of a contract to cause wrongful loss or gain (IT Act section 72A, up to 3 years), identity theft (66C), cheating by impersonation (66D), stalking or threats.
• Realistic outcome: most people get results from a firm written complaint and the regulator or ombudsman. Courts take years. Consult a lawyer before suing.

From 13 May 2027: the Data Protection Board

From 13 May 2027 the DPDP Act's duties apply. The company is responsible for processing done by it or by anyone processing on its behalf (section 8(1)), may use a processor only under a valid contract (section 8(2)), must protect your data with reasonable security safeguards (section 8(5)), and must tell you and the Board about a breach (section 8(6)). It may use your data only for the lawful purpose you agreed to (sections 4 to 6). Section 44(2) removes IT Act section 43A from that date. Complain to the company first; if it does not resolve it, complain to the Data Protection Board. The Board can impose penalties up to Rs 250 crore, but penalties go to the Government (the Consolidated Fund of India, section 34), not to you. For money, use the ombudsman or the Consumer Commission. Appeals from the Board go to TDSAT within 60 days (section 29).

If it is fake: urgent steps

1. If you shared an OTP or password, call your bank's official number and 1930 at once.
2. Change passwords and turn on two step login.
3. Report the number on Chakshu.
4. Register DND on 1909 if it was a sales call.

Step by step guides:

Related guides

• Spam calls, SMS and telemarketing Block marketing, complain within 7 days, and report fraud calls on Chakshu.
• Data breaches and leaks What to do when a company leaks your data, and what you can demand.
• Mobile phone companies Airtel, Jio, Vi, BSNL and others: SIM fraud, KYC misuse, billing, porting and complaints.

See also when a platform shares your data with a third party and the escalation ladder.

Official sources

Checked on 1 November 2026. Company pages are labelled as the company's own words.

• IT (Reasonable Security Practices and Sensitive Personal Data) Rules, 2011 (India Code)
• IT Act section 43A: compensation for failure to protect data (India Code)
• National Consumer Helpline (Department of Consumer Affairs)
• e-Jagriti: file a case before a Consumer Commission
• Digital Personal Data Protection Act, 2023 (MeitY copy of the Gazette)