1. First, keep the evidence and file a case with the police.

2. Go to the Industrial and Commercial Bureau to complain;

3. Call the mayor's hotline 12345 to make a complaint;

4. Go to China v. Net to report rights protection;

5. Go directly to court for prosecution;

6. Defend rights with other victims.

This answer is for reference only, investment is risky and trading needs to be cautious. Please seek legal assistance from a professional lawyer for the actual situation.