Incorrect dash vin tag

Try to get your money back.

If that fails, sue the bastard.

One way or the other, report it to your state police right away so they can document the evidence, this will help your lawsuit if he does not refund all your money and associated costs.

If NY requires vehicle insurance and the insurance documents are for the dash VIN and not the car, insurance fraud also comes into play here.

You have a rolling crime scene, it is best for you to report it right away. Let your state police look over all the evidence.

If there is any delay, the defense and the judge can ask you why you waited once aware of the crime.