If you are cheated, you can call the police, but you don't have many times, that is, mediation. If you are old, you can file a case with the public security bureau.
If the number of people is a transaction dispute, you can report consumer fraud to the market supervision and management department. I have handled many cases, but you have to make it clear that they are not a US group. This is a fraud ring. The battery car is a prop for their fraud. So don't pay the loan. This is a civil dispute, which can provide a place for both parties to negotiate, but the solution still depends on your own negotiation.