What kind of hotel is this hotel? Is it a chain hotel or what kind of hotel For hotel chains, you should ask the head office. If it is an ordinary hotel, you should consult the Consumers Association in Shenzhen. If it still fails, you can only resort to legal means.
Also, without your permission, your credit card is not allowed to deduct money. This knowledge suggests that you consult a bank.
I don't know how you guarantee this credit card. Do you only report the card number, or do you report it together with the expiration date and check code? If it is the latter, it may not be easy.
And the law is the most effective means!
I wish you a smooth solution!