I've had rust on all 4 of my doors on my 2006 Audi A3. Rust is coming from inside the paint, which means its perforation and is not caused by something done by me or my driving. I've been on there ass for almost 8 months and nothing....
Whats worse.... I made the decision to keep my car since she runs impeccably, and so I went out and purchased an AWE Turboback Exhaust, and Koni FSD suspension. It now sits in my veranda, and I've been contemplating on what to do.
My only other idea was to simply go to the stealership and "purchase a pre-owned", and when I tell them I have an impeccable, rust free, 12 yr corrosion warranty 2006 A3, I'll wait for the quote. Then double back and let them know my doors are all rusting at the bottom seams, and wait to see how much of an ass they make themselves, when they try to de-value my vehicle because of the rust perforation they are "supposedly going to cover under their warranty".