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How To

How to Block a Lost Card and Dispute a Fraud Charge in Chennai

Report a lost card or fraudulent charge within three working days and RBI rules make the loss the bank's. How to block it, dispute it and what changes in 2027.

Lost card or fraud charge? Act within days

If your debit or credit card is lost, or you see a transaction you did not make, block the card and report it to your bank straight away. Under the RBI’s 2017 rules on limiting customer liability, which still apply to transactions this year, you bear no loss for a fraud caused by a third party if you report it within three working days of the bank’s alert. The bank must then credit the disputed amount to your account within 10 working days.

Report later and your loss can be capped but not zero; report after seven working days and the bank’s own policy decides. From 1 January 2027 a new RBI framework takes over with a five-day window and compensation for small frauds, so it pays to know both sets of rules.

3 daysworking days to report for zero liability
10 daysworking days for the bank to credit you
90 daysmaximum to resolve the complaint

Before you start

Document Who needs it Notes
Card number or last four digits Everyone Found in the app or on statements
Registered mobile number Everyone Banks must send SMS alerts and let you reply to report fraud
Details of each disputed transaction Everyone disputing Date, amount, merchant, from the SMS or statement
Complaint or acknowledgement number Everyone Banks must issue one immediately
Cyber crime complaint number Victims of online fraud From 1930 or cybercrime.gov.in

Source: RBI circular of 6 July 2017.

The steps

  1. Block the card immediately. Use your bank’s app or net banking to block or hotlist the card, or reply to the transaction SMS, or call the helpline printed on your statement. The RBI requires banks to offer reporting channels 24×7, including SMS, phone and the website.
  2. Report each unauthorised transaction. Blocking stops future misuse; it does not dispute past charges. Tell the bank which transactions you did not make, and note the time you reported.
  3. Get the complaint number. Banks must acknowledge your report at once with a complaint number and record the date and time. This is your proof that you reported in time.
  4. Report online fraud to the police. For phishing, OTP or online card fraud, call 1930 or file on cybercrime.gov.in. This can help freeze money before it moves.
  5. Follow up in writing. Email or write to the bank listing every disputed transaction. If you never shared your PIN or OTP, say so: the bank carries the burden of proving that you were negligent.
  6. Check for the shadow credit. Within 10 working days of your report, the bank must credit the amount, value-dated to the transaction, without waiting for an insurance claim.
  7. Get a replacement card. Order it through the app or branch, and where your bank allows, switch on only the uses you need, such as domestic or contactless.
Six steps to block a lost card and dispute a fraudulent transaction, from blocking the card and reporting to the bank to the reversal and escalation to the RBI Ombudsman.
What to do the moment a card goes missing

How much you can lose

When you report a third-party fraud Your maximum liability
Within 3 working days Nil
4 to 7 working days, basic savings (BSBD) account ₹5,000 or the transaction value, whichever is lower
4 to 7 working days, most savings accounts and credit cards up to ₹5 lakh limit ₹10,000 or the transaction value
4 to 7 working days, other current accounts and cards above ₹5 lakh limit ₹25,000 or the transaction value
After 7 working days As per the bank’s board-approved policy
Bank’s own negligence or fault Nil, whenever you report

Source: RBI circular RBI/2017-18/15, 6 July 2017. Applies to scheduled commercial banks, small finance banks and payments banks.

If you shared your PIN or OTP, the loss up to the moment you report is yours, but anything after the report falls on the bank.

1 Jan 2027

For transactions from this date, new RBI directions give zero liability if you report within five calendar days, and pay 85% of losses up to ₹50,000, capped at ₹25,000, once in a lifetime, as summarised by Fox Mandal after the RBI’s 24 June 2026 release.

The 2027 rules also cut the time banks get to resolve complaints to 45 days for domestic frauds and 60 days for cross-border ones.

Common mistakes

It’s often said that the customer has to prove they were not careless before the bank will refund.

In fact the RBI circular puts the burden of proving customer liability on the bank.

If it goes wrong

If the bank does not credit you in 10 working days, or rejects the dispute, escalate to its grievance or nodal officer in writing. If there is no fair reply within 30 days, file with the RBI Ombudsman at cms.rbi.org.in under the Integrated Ombudsman Scheme, 2026; you generally have 90 days after the bank’s reply period. For large losses, consider legal advice.

Quick answers

How fast must I report a fraudulent card transaction?

Within three working days of the bank’s alert for zero liability under the current rules; from 2027, five calendar days.

When will the bank return my money?

It must credit the disputed amount within 10 working days of your report, and resolve the complaint within 90 days.

Does blocking the card dispute the charges?

No. Blocking stops new misuse. Report each unauthorised transaction separately and get a complaint number.

Information checked against official sources on 19 October 2026. Fees, dates and rules can change; confirm on the linked official pages before acting.

Sources

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