Thats not good mate, I hate parking in supermarket carparks at the best of times, and its because of things like this!
Bit of a distance for you, but the Glasgow Audi repair centre in Hillington would do a excellent job, and they aint the cheapest. Would be good for a quote if nothing else.
Dont really understand why they're getting to pick the garage your car gets sent to, it is up to you to decide where it goes. If you crashed into another car you wouldnt be able to tell the owner where to get there car fixed.
It should be the same with this!