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Paid cash for a car, but dealer wants to change price
I had a similar situation when I was in college. The difference was that the dealer agreed to finance and the bank they used wanted a higher interest rate from me because of my limited credit history. The dealer asked for a rate 5 percentage points higher than what they put on the paperwork. I told them that I would not pay that and I dropped the car off at the lot with a letter rescinding the sale. They weren't happy about that and eventually offered me financing at my original rate with a $1000 discount from the previously agreed-upon purchase price. What I learned through that experience is that I didn't do a good-enough job of negotiating the original price. I would suggest that your son stop answering phone calls from the dealership for at least 1 week and drive the car as much as possible in that time. If the dealer has cashed the check then that will be the end of it. He owes nothing further. If the dealer has not cashed the check, he should ask whether they prefer to keep the check or if they want the car with 1000 miles on the odometer. This only works if your son keeps his nerve and is willing to walk away from the car.