Hopefully youll get a refund. If a solicitor or architect gave you incorrect advice you'd be liable for a refund and any consequential costs. Its no difreeent for any other expert, and the dealers do promote themselves as 'experts' by any sensible definition or the term, ie, the only properly qualified, resourced and manufacturer backed place to take your vehicle for work.
If they arse you about you can make it the credit card company's problem