Under normal circumstances, when bank customer service calls, most of them are for business promotion. But if you receive a call just after swiping the card, it means that the system may have detected an abnormality in your card use.

For example, if the card is used fraudulently, cashed out, or other violations occur, the bank needs to verify the identity of the person who swiped the card. Therefore, the bank’s purpose of doing this is also to be responsible for its users.

I believe everyone has received similar calls, but this is just a normal monitoring measure of the bank. It will not be a big problem for us to use credit cards normally.

The bank will not ask you for a receipt for no reason. If you don’t believe it, you can ask. More than 99% of cardholders have never been asked for this. It was caused by your own cashing out, and there must be no problem with normal use. Cashing out is an illegal act in itself. The bank's credit card risk detection system is very advanced and can capture cashing out more accurately.