If you receive a call from someone pretending to be a debt collector in the name of China Construction Bank, you must be vigilant. If it is a real debt collection call from China Construction Bank, it will only tell you how much you owe now and for how many days. You should pay it back as soon as possible. What are the consequences if you don't pay it back? They will ask you when you can pay it back, and no matter what, they will not give you your account number or ask you to transfer money over the phone, or ask for your card information, or the expiration date. If this is the case, then no matter what he says or what number he calls, it will all be false.