Hi depending on when you purchased the car you can go to trading standards and they may pick up the flag and petition them under the fit for purpose act, Audi wont care but if you also email VAG customer service they may well help you as they are not fans of this type of thing, I did the same last year when one of their approved franchise TPS were running me ragged over a part, the car was suspended on a four poster ramp for four days waiting for the part which was already paid for and was suddenly on back order three weeks so I emailed VAG customer services and explained my problem and dissatisfaction, the next day the part arrived with a red faced area manager who demanded to know who Steve was, the guy that put in the complaint, I stepped straight up and explained why, he went for the sympathy vote saying how much trouble I caused him, my heart bled for him not, VAG take things like this seriously its bad PR for them.
Steve.