If you are in Sri Lanka and lose your bank card or it is stolen, the first thing you should try to do is contact your bank.
Many banks have an emergency number for customer service that is available around the clock. You can call this number to have your card blocked. Inform the bank about the loss or theft of your card and provide all relevant information such as your account number and card number.
If you are unable to contact your bank directly, there are other options.
For example, you can contact the card issuer. This is often the case with credit cards issued by third-party providers. In this case, you can contact the card issuer directly to have the card blocked.
Another option is to block the card via online banking. Many banks offer this function, which allows you to log into your online banking account and block your card. If you have access to your online banking account, you can block your card quickly and easily.