I bought something for him and he gave me black money. What should I do?

Call the police promptly.

This is a new crime in the criminal law, which requires criminal liability. Since it is a criminal case, it is recommended that you actively entrust a lawyer to defend the person who may be held criminally responsible and sentenced.

After entrusting a lawyer, the lawyer will go to the detention center to meet with the client as soon as possible, inquire about the relevant case information, actively communicate with the public security organs, look for favorable situations, actively defend, and strive for a lighter punishment.