Want to hear a worse story?
I took my Renault Megane to them for a service and it was returned with a dash warning light continually on, after a great deal of argument and them more than implying it was on already (it most certainly wasn't), I returned the car a total of four times. Not once did they manage to do a single thing and a few weeks later the engine blew up - my bill £6,000 for their mistake. I still have no idea what they did or how, nor have I been successful in chasing them for the last 2 years. You got off lightly!
Furthermore, a friend unwittingly took her car to Nationwide for MOT (its first one), the car had done 8,000 miles in three years and she was quoted nearly £700 for repairs after it failed. She drove the car (not allowed I know) to the next garage and it passed the same day!
These people are crooks