1, collect good evidence, such as the contract when you joined, the text messages contacted by both parties, the documents you paid and other evidence that you think can prove that they cheated you.
2. It is best to take the above evidence to the local public security bureau to report the case and file a case for investigation.
If it can't be identified as a criminal case after your efforts, you can take the evidence and bring a lawsuit directly to the court.
Generally speaking, it is a long process and a long memory for myself. After all, it is understandable that you have just entered the society and suffered some losses. I hope you can pay attention to it in the future and learn from it.