Legal analysis: no police. It depends on whether a contract was signed at the beginning and how it was agreed in the contract. If there is a contract, you can get the balance back according to the treaty of refund of class withdrawal, or you can go directly to arbitration.

Legal basis: Civil Code of People's Republic of China (PRC).

Article 3 The personal rights, property rights and other lawful rights and interests of civil subjects are protected by law, and no organization or individual may infringe upon them.

Article 465 A lawfully formed contract shall be protected by law. A legally established contract is legally binding only on the parties, except as otherwise provided by law.