What the company does is illegal, so you can ignore it. Resignation According to the Labor Contract Law, it is enough to submit a resignation report one month in advance without the approval of the employer.

People's Republic of China (PRC) labor contract law

Article 36 The employing unit and the employee may terminate the labor contract through consultation.

Article 37 A laborer may terminate the labor contract by giving a written notice to the employing unit 30 days in advance. The employee may terminate the labor contract by notifying the employer three days in advance during the probation period.

Article 38 A laborer may terminate the labor contract under any of the following circumstances:

(1) Failing to provide labor protection or working conditions as agreed in the labor contract

(2) Failing to pay labor remuneration in full and on time.

(3) Failing to pay social insurance premiums for laborers according to law.

(4) The rules and regulations of the employing unit violate the provisions of laws and regulations and damage the rights and interests of workers.