A8L2006

I have had the same issue with my 2006 A8L on passanger front wheel. I have also noticed that it has been the same wheel for everyuone having this problem. Also, notice this airshock is a diffrent model then the other 3 on the car. Why was this airshock never recalled? Anyone know how to file a complaint to Audi about this issue. Talking to a after market rebuilder of the airshock says it is a defective seal ring on the top of this shock that cost $.50 and the dealerships charge $2,400 to $3,500 depending on where you go.