First of all, the staff returning to the credit card center can use standard Mandarin.

Secondly, the real official customers must use the official customer service phone number when returning. It is suggested to check the official customer service telephone number of China Bank Credit Card Center online for verification.

Third, customers will not ask for payment related key information, such as payment password and 3-digit verification code on credit card. Remember not to disclose this information.

Fourth, even if the official customer calls back, you don't have to answer or reply, so if you have doubts about receiving similar calls again, you can directly refuse to answer or hang up.