Mate try your local Audi dealer, ive really scuffed one of mine and they've quoted me £75 to fix it and its much worse than yours and look at my style of wheels (Ive even taken the black paint off) and I didnt think it was a bad price from a stealer as my mates got a friend who quoted me the best part of £100 to fix it!
That's actually a very reasonable price.
As other's have said, you'll need a wheel refurbishment shop who can diamond cut the wheels and then re-lacquer if you want it 100%.
However, the damage doesn't actually look that bad. If you were to remove the scuffed metal you may find that with some fine wet/dry sandpaper, wetted down, you could polish that back to smooth metal again to improve the appearance. This will leave the alloy exposed to the elements and invite corrosion, but you could polish and seal the wheel (e.g. Poorboys) to prevent this or apply clear lacquer to the repaired section to protect it.
Failing that Lepsons (
http://www.lepsons.com/) will definitely be able to help. They're true professionals with excellent customer service to boot.