Yesterday, I was tricked into going to the gym to get an annual card and paid a deposit of 400 yuan. I don't want to apply for a card today and ask for a refund of the deposit. They lied about not returning it. What should we do? Even if you don't write "non-refundable deposit", you won't come back. The deposit is to protect both parties to the contract. If you collect the deposit before signing the contract, to ensure that the offeror and the promisee fulfill their contractual commitments, they will confiscate the deposit if you don't go to his place to exercise, and if you pay the deposit and they won't let you exercise, they will double your deposit. To tell the truth, if you pay the deposit, you won't come back to anyone. This is not a strong buying and selling by merchants. It's not called "deposit" if you can get it back. Look for contract law online when you have nothing to do.