The next day, the card refund Commissioner will call you (it is better not to answer it, that is the mystery mentioned above), ask why you want to return the card, and then suggest that you don't return the card and give you benefits such as points or annual fee exemption. At this time, I hope you strongly insist on canceling the card, otherwise it will be easy to give up and be cheated. The bank depends on the credit card holding rate, so it will "not recommend" you to cancel (when I cancel)