You confirm that there is no binding, not your own bank card. You are the only one on WeChat, and no one else is logged in. There is only one possibility, see if you have used your mobile phone number to log on to WeChat. If so, your number has been used by others before, and now it is useless for others to use it. I'll open it for you after the company such as Mobile cancels. In the past, bank cards were bound.