You should write your resignation report three days in advance, and then he will sign it and bring it back. Find the local labor bureau. Deducting wages is definitely illegal. If the coordination fails, you should apply for labor arbitration, take photos of the business license of their store, and then collect the evidence of your work in their store. All evidence, such as witness, can be used. This is what labor arbitration needs. If it's just an appeal mediation, you only need to write your resignation letter three days in advance. If there is a contract, take the contract. If there is no contract, take evidence to prove that you worked there.