NHTSA Complaint #11507705 — 2007 AUDI A4

My 2007 Audi A4 is part of the Takata airbag lawsuit so I scheduled an appointment to have it repaired at Audi of Tampa. I had my car towed there because the battery recently died and I was told I needed to have the key reprogrammed because it would not start after replacing the battery and figured I could have both repairs done at the same time. My appointment was at 7pm but when I arrived nobody had any knowledge of my appointment and was told they do not make appointments that late in the day but a technician would give me a call. I leave my car there and receive a call today from the repair technician Tyler King who proceeded to tell me that prior to doing anything to the car he'd have to run a diagnostics test that would cost me $500! WHAT? Just to give a diagnosis that I've already been given? Insane. So now that I do not have that kind of money what am I supposed to do? Tow it back home and have a locksmith reprogram the key and ignore the airbag issue? I feel unsafe in the Audi I once loved and relied on daily and don't know how I am supposed to proceed with this.