123 15 The process of returning the card to the gym is as follows: 1. Open Alipay, search 123 15, and select a complaint.

2. Enter the address, credit code and other information of the gym, which can be searched through enterprise search or Baidu and other platforms.

3. When complaining about problems, choose to use prepaid cards to infringe on consumers' rights and interests, and advocate the choice of refund.

4. Just wait for the market supervision department to handle it.