Ditto on all the above. As well as go and have a chat with the owner of the dealership. Tell him what's going on and you might just mention a lawyer while your talking with him.
The owner will most likely side with you even without the mention of the lawyer. If he doesn't then mention your lawyer should be contacting him soon.
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FOR SALE: 1996 Mustang GTS: 5-speed, K&N, removed air silencer, 3.73s, 48,000 miles. $11,500