Secondly, the contract is null and void because neither party has signed it.
You can apply for a card refund.
If the gym disagrees, you can find a lawyer and the media to expose it. Don't be afraid of trouble.
Gyms often use many of us who don't know the law and are afraid of trouble to try our best to get people to apply for cards. At first, many people couldn't resist their brainwashing marketing methods. But they didn't care whether they made money or not, and even many people ran away later.