Ok ...from my point of view if these pads werent suitable giving you a suitable ride, then I would ring my supplier and see if we could credit these ourselves. Which AutoBarn store did you go to?
Usually once something has been fitted to a car and used, then you have basically given up the right to bringing them back. But on the other hand the refund policy states if something isnt suitable to the application then some sort of credit or refund situation is required.
Nothing beats the sound of a V8