Ifa price is agreed they must stick to the price unless they said it might be higher. They cannot exceed the max they quote.
If no price is agreed (not in this case), the price under Supply of Goods and Services Act, must be reasonable.
If they wont give you the car back unless you pay up, pay under duress and sue for the extra over £1000 in small claims court. Simple and quick here. www.moneyclaim.gov.uk
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