How to complain about the company's fake social security?

You can apply to the company and ask the company to insure employees, which is stipulated in the Labor Contract Law. No one can break the rules. If the company insists on not doing it, you'd better complain to the local labor department with valid evidence such as work permit, attendance record and salary slip.

Once the labor management department has verified that the unit has not gone through the employment procedures, it will be severely punished.