If you take it back, they should give you free labor, AT LEAST. you've already spent a ton of money and not had results.
If they don't give you the labor back, consider going to small claims court to get your money back, and take the car to a Ford Dealer.
Woe to him who builds his palace by unrighteousness,his upper rooms by injustice,making his countrymen work for nothing...Does it make you a king to have more and more cedar?Did not your father have food and drink?He did what was right and just,so all went well with him. He defended the cause of the poor and needy,and so all went well...But your eyes and your heart are set only on dishonest gain,on shedding innocent blood and on oppression and extortion. Jer 22:13, 15-17