What all did they do to it?
Reason I ask is this -- if you're even a little bit mechanically inclined and have some patience, a LOT of stuff on Audi isn't terrible to fix, you just need the tools, some patience, and the information (you can buy access to the entire service manual for your car if you plan on keeping it for awhile; the manual tells you (with pictures) how to fix everything, as well as what you need to remove, etc).
I just helped a guy fix a low oil pressure light (he needed a camshaft and an oil control valve, as well as a cam adjuster magnet) and do a set of timing chains on his 2.0T. I just sat there and watched and answered any questions he had; $800-900 in parts vs a $4000-5000 bill from the dealership.