Pay attention to the collection of evidence. Evidence can be divided into witness and physical evidence. A de facto contractual relationship can also be formed without signing a contract. As long as you can form a chain of evidence, such as some related expenses paid by the employer, you can prove that you have formed a de facto labor contract. The specific salary is more troublesome. It's all verbal contracts. You can talk to the employer and record at the same time. Although the court may not be able to adopt it when suing, it can still be considered. Cooperate with the testimony of other workers. If the corresponding work is done in detail, you can negotiate with the company and estimate the benefits without suing. Companies will also weigh the pros and cons. Complaining is a way, but it is the most irregular. Your evidence is sufficient. You can ask them to help you coordinate through the labor management department. If you can't do it in the end, sue him. Petition has little effect, but you have to prove that you have not violated labor discipline during your work, so that the employer has an excuse.