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Whilst you can argue that a legally binding contract was made, the dealer could also argue that the contract was entered into under the assumption of a mistake and a mistake in law can make a contract unenforceable. In other words, if a genuine error as made by a party then the other party cannot be allowed to benefit from that mistake and try to enforce the contract. This is all quite a complex technical legal area but such a defence is possible on the dealer’s part.
The other consideration is that you cannot really force them to sell the car at the agree price. No one can physically force them to give you the car in exchange for the price you agreed. The best you can hope for is to find a car of equal specifications and show that you have had to pay more when compared to the deal you had agreed. However, that is still on the assumption that the dealer cannot show that there was a mistake which made the contact unenforceable.
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