You can complain to the local labor inspection department, and they will supervise and inspect. If an illegal act is found, you can bring a lawsuit directly to the court.

According to the social insurance law of People's Republic of China (PRC), if the employer fails to register for social insurance, the social insurance administrative department shall order it to make corrections within a time limit; If no correction is made within the time limit, the employer shall be fined more than one time and less than three times the amount of social insurance premiums payable, and the directly responsible person in charge and other directly responsible personnel shall be fined more than 500 yuan and less than 3,000 yuan.

The employing unit shall pay the basic old-age insurance premium, basic medical insurance premium and unemployment insurance premium in proportion to the total wages of its employees as stipulated by the state, and include them into the basic old-age insurance fund, basic medical insurance fund and unemployment insurance fund respectively.