Brake Disc Pads problems of the 2007 Audi Q7

I was driving my Audi Q7 the 25th of August of 2010 in miami, FL when the brakes suddenly stopped working and I ran a couple red lights trying to stop the vehicle. In the mean time, I turned the drive shift to neutral position and I started pressing the brake pedal several times until it finally stopped the car slowly. I stopped in a safe place and I call Audi tow assistance, they came in about an hour to pick my vehicle up and took it to the dealership (prestige imports). I am extremely disappointed with the services rendered by the dealership because I took the vehicle to inspection and repairs when it reached the 60,000 miles back on April, 2010, at which time I was charged for the front brake pads replacement (see attached receipt). I am terrified about what would have happened to me if instead of being in a regular street I was on a highway or if there were cars waiting on the traffic lights. I want to notify prestige imports and Audi of americas about my concerns in reference to the quality of the services rendered at this facility and the safety of this vehicle and I am concerned whether the brake pads replacement was really done as required by Audi's manual.