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there is no right to return a car once a contract has been signed. the three day "cooling off" period only refers to sales that are made unsolicited door to door.
if you were deceived during the sale then you can contact the consumer protection division of the Attorney General and make a complaint. but there are no laws mandating a dealer take a car back.
read this link for the specifics on returns which supports my answers
you can speak to the manager and state that the AG is going to investigate their fraudulent sales practices and after the AG gets through with them you will sue them. they lied and that is fraud. you need to report the sale to the AG - 9 out of 10 times they come around. no one wants the AG investigating them