Call your bank’s customer service number. Search this on Google. For example, if you have an SBI card, type “SBI customer service number”

An automatic voice call will ask for reasons why you want to connect. Opt for talking to a bank executive and communicate the need to block the card

Keep your bank account number or debit card number handy and share it with the executive

The bank representative will block the debit card. This means that your card becomes invalid for future use so you don’t have to worry about theft or unidentified withdrawal of money

Apply for a new debit card.