No contract, the existence of a de facto labor relationship between the two sides are protected by law, if there is no legal reason to dismiss the worker, you can claim compensation.

You can put your situation in writing, find ways to collect evidence to prove that you work here, such as: labor contracts, employment notices, social security lists, bank payroll slips, work cards, uniforms, video recordings of the work site, signed by you and others in the unit's signature or seal of the bill, stamped staff roster, unit cards, keys, attendance records, leave notes, employee testimony and so on. The company's main goal is to provide you with the best possible service, so you can apply for labor arbitration (free of charge) at the local Labor Dispute Arbitration Committee to protect your legitimate rights and interests.