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Paid cash for a car, but dealer wants to change price
Your son is in the right. But he broke the "unwritten" rules, which is why the car dealer is upset. Basically, cars are sold in the United States at a breakeven price. The car company makes ALL its money on the financing. If everyone bought "all cash," the car companies would not be profitable. No one expected anyone, least of all your son, a "young person," to pay "all cash." When he did, they lost all the profit on the deal. On the other hand, they signed a contract, your son met all the FORMAL requirements, and if there was an "understanding" (an assumption, actually), that the car was supposed to be financed, your son was not part of it.  Good for him. And if necessary, you should be prepared to back him up on court.