The reason is:

(1) Legally

Although there is no written contract, opening a card means that the contract is established.

Rejecting the card means canceling the contract. As long as the gym doesn't break the contract, you have no right to cancel the contract unilaterally, so you can't return the card.

(2) Reasonable (profit)

If they quit, it will be very troublesome for them, which will damage their reputation and reduce their performance, so they simply refuse to quit.

(3) how to do it?

1. If not, you can transfer the card yourself or through the company.

2. Complaining to the Consumers Association that the service is not in place, too many people can't enjoy the service they deserve after paying the money, which is a bit mean, but sometimes it is more useful than going to court.