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Paid cash for a car, but dealer wants to change price
I have one additional recommendation: if the dealer continues to press the issue, tell them that they need to drop it, or you will write a Yelp review in excruciating detail about the entire experience. Used car dealers are very aware of their Yelp presence and don't like to see recent, negative reviews because it can cost them a lot of new business. (I'm assuming this is a used car. If it's a new car, you could go over their heads and bring up the problem with the manufacturer. Dealers hate it when you go directly to the manufacturer with a dealer complaint.)