If no contract is signed, the factual labor relations between the two parties shall be protected by law. If there is no legitimate reason to dismiss an employee, you can claim compensation.

You can write down your situation and collect as much evidence as possible to prove that you work here, such as: labor contract, employment notice, social security form, bank payroll, work card, work clothes, video of work site, documents with your signature and the signature or seal of other people in the unit, stamped employee roster, company door card, key, attendance record, leave slip, employee testimony, etc. And go to the local labor dispute arbitration commission.