In order to cancel successfully, you must ensure that there is no debt or balance in your card, and there is no debt or balance of a penny or more.
After checking some of your identity information, I will ask you the reason for cancellation. It is best not to say that you don't want to use it (such reasons will be recorded). It can be said that it is because of work or card damage or something.
After customer service agrees to cancel the card, it will not be displayed immediately, and there may be a delay transition. You must follow up and feedback the results. Don't worry, the card has been cancelled.