Air Conditioner problems of the 2006 Mercedes Benz ML350

I purchased mercedes ml 350, 2006 in April 2006. From driver's seat, the left side view mirror is only partially visible! I showed this to hbl dealership in tysons corner virginia, and they agreed to this design issue. When the ac is turned on, many time, due to variation in inside and outside temperatures, small fog forms out of the window at a location, that the fog now completely obscures the side view mirror! the mirror cannot be used any moree by the driver, causing a safety hazard! again the issue is agreed by the dealership as design issue. Contacted mercedez benz at 1800-367-6372 ext 6, id# is 4635. She still thinks the car has no issue even if the dealership and myself think otherwise! she felt at the best she can do is just apologize! help!!!!!!!!!.