Legal analysis: If there are justified reasons, it shall be refunded after deducting reasonable expenses. If you want to return it for personal reasons, it may constitute a breach of contract, and the money you have paid may not be fully refunded because you have to compensate the other party for some losses. In terms of evidence, although there is no contract, there is still room to prove the facts of the contract with invoices.

Legal basis: Article 34 of the Civil Procedure Law of People's Republic of China (PRC), the parties to a dispute over a contract or other property rights and interests may, by written agreement, choose a people's court in a place that is actually related to the dispute, such as the defendant's domicile, the place where the contract is performed, the place where the contract is signed, the plaintiff's domicile, and the place where the subject matter is located, but it shall not violate the provisions of this Law on hierarchical jurisdiction and exclusive jurisdiction.