Legal analysis: A service contract relationship has been formed between consumers and gyms, and both parties should fulfill their respective obligations according to the contract. Consumers' request for card refund is a unilateral termination of the contract, so whether the contract can be terminated depends on the contractual agreement of both parties. Refusing the card is a consumer breach of contract. Whether it is reasonable to deduct 30% of the liquidated damages is determined according to the contract between the two parties. If there is a clear agreement in the contract, a penalty of 30% of the handling fee will be charged, which does not violate the proportion stipulated in the Civil Code and relevant judicial interpretations in the Supreme People's Court. Of course, you can also claim appropriate relief from the court; If there is no clear agreement in the contract between the two parties, the gym needs to prove the calculation basis of liquidated damages.

Legal basis: Article 585 of the Civil Code of People's Republic of China (PRC), the parties may agree that one party shall pay a certain amount of liquidated damages to the other party according to the breach of contract, or agree on the calculation method of the amount of damages for breach of contract. If the agreed liquidated damages are lower than the losses caused, the people's court or arbitration institution may increase the liquidated damages at the request of the parties; If the agreed liquidated damages are excessively higher than the losses caused, the people's court or arbitration institution may appropriately reduce them at the request of the parties. If the parties concerned pay liquidated damages for delayed performance, the breaching party shall also perform the debt after paying the liquidated damages.