Hello, the lawyer's reply to the question you described is as follows:

First of all, you should confirm the facts of labor relations with the company, such as payroll, attendance records, and document records during work.

Secondly, after confirming the labor relationship, you can ask the unit to reissue the salary for the illegal behavior of the unit in arrears. If a written labor contract is not signed within one month from the date of employment, double wages will be paid.

Third, if negotiation fails, bring relevant information to the labor inspection department to complain, or directly submit it to the labor arbitration committee where the unit is located.

Blessing!