I am trying to get detaiuls about an Audi fitted towbar. They are quoting me in excess of £1300 to fit one. THey say its because the entire rear of the car needs replaced and that the car needs a software update. They also say its only audi who can do it without causing damage to the wiring and canbus programming. I am beiong ripped off? Previous cars only cost up to a max of £500.