Block the card
Use your issuer's app, helpline or website to block the card as soon as you notice a problem.
Report the transaction in writing
Report each unauthorised transaction and keep the complaint number. For cards issued by commercial banks, reporting within three working days matters for your liability.
Raise merchant disputes promptly
For undelivered goods or wrong charges, file your issuer's dispute form with documents within its deadline for your card network.
Escalate if needed
If there's no reply within 30 days, or you are unhappy with it, file with the RBI Ombudsman at cms.rbi.org.in within the 90-day window.