NHTSA Complaint #11622403 — 2013 AUDI Q5

I was doing maintenance on car. Had new tires and alignment done. The alignment tech found rotted out rear sub-frame underneath plastic covers. Said that it was unsafe to drive. Had it fixed there. Mechanic had another Q5 on rack, he said it had exact same problem. Tried to find used parts, ALL had rot through the frame. Found a part in Texas that was clean and bought it to replace. Asked Audi USA to reimburse me for the cost as they have a supposed 12 yr rust through warranty. They told me no because it only applies to body parts and that I didn't get it done at an audi dealer. The plastic cover is the issue as it keeps the moisture locked into the part. Audi A6s have the same frame but no cover and they don't rot. This is a dangerous situation and Audi is looking the other way.