I worked without registration and was sent away, what are my rights?

The first thing we need to understand is what was described in that contract: if you worked as an employee, you have rights, as if it were a CLT (Consolidation of Labor Laws). There you will be entitled to Christmas bonus, third vacations, reflexes. Now, what you need to understand is what was agreed. The agreement is never expensive, and he needs to honor what was described there. That's it. The important thing is to talk to a labor lawyer who will be able to guide you.