What to do if a dealer wants to renegotiate a vehical purchase after the bank has all of the financing paperwork?

Question Details: We went into a car dealership on Saturday and started the paper work, we received financing and went in on Monday and signed the paperwork. (We drove home with the car). During the process we provided the dealership with information regarding our trade in (car not starting/not running, transmission, dents/dings etc) and they gave us a trade in value sigh unseen. They called back on Tuesday after we signed the papers and walked off the lot with the new vehicle stating that the trade is not worth what they gave us. Can they do this? They are now trying to contact the bank.

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