Really sorry to hear that, but quite understand why you have cancelled after being messed around for months. The Q3 is a great car, and Audi dealers are a lot more helpful, and on the ball than Peugeot's.
I have now been waiting nearly 3 months for my dealer to come back with a fixed price service plan on my 3008, despite weekly reminders from me, and complaints to Peugeot Customer Services. I am now so annoyed with them that I have decided to walk away and get my car serviced by a reputable and highly recommended local garage. At least I know that the mechanics there are highly skilled, reliable people, and not a bunch of spotty teenage muppet trainees on minimum wage, who couldn't give a toss about your car.
Good luck with your Audi, because if my experience of Peugeot UK and their dealers is anything to go by, you have made a sensible choice.