We had a reputable car brand dealer try to trick us into pathologically bad deal. First by hiding interest rate and offering us what amounted to 13.5% - which I called them out for and calculated their “mistaken rate”. Then already after the test drive, while starting to sign, they switched the VIN to a much worse equipped car (same price) hoping we would not notice!!! We did. In the end, we got what we came for, $3k under market and left them red faced.