First, if you are sure that you didn't let the bank open it, but the bank opened it for you privately, you can talk to the bank manager directly. If the bank violates the rules, you can not only get back the 500 Yuan You deducted every month, but also ask the bank to compensate you for your mental damage compensation and return fare.
Second, if it is really a bank's illegal operation, please stand firm and don't be deceived by the evasive tactics that banks have been using.
Third, I wish you success!