Customer purchased a 2012 Mercedes Benz S550 and prior to delivery we replaced front and rear brake pads and rotors(using factory parts). After he drove the car home he stated the brakes make a squeeking noise, without contacting service he dropped off the vehicle and we got the car right in, addressed his concern and road tested the car to verify no noises. We contacted the customer to inform him of what was done and he came to pick up the car. 3 days later he called and said the brakes are still making noises. We are trying to coordinate a time that is convenient for the customer to come in so we can verify the noise and make him happy.