Legal analysis: if there is fraud, coercion, damage to the third party or public interests, or cover up illegal purposes in a legal form, you can claim that the contract is invalid through litigation; If the contract is confirmed to be invalid, you can ask for the return of the due money. If you think there is a major misunderstanding or obviously unfair in the contract, you can request to cancel it and ask the other party to compensate for the losses caused to you. If there is any dispute, I suggest you entrust a lawyer to intervene.

Legal basis: Article 507 of the Civil Code of People's Republic of China (PRC) (hereinafter referred to as "Civil Code"), the ineffectiveness, invalidity, cancellation or termination of the contract shall not affect the validity of the clauses on dispute settlement in the contract.