Brake Whistling Noise Problems of Volkswagen Jetta

I purchased a 2009 Jetta tdi. This is my 3rd Jetta tdi, 2004, 2006, and now a 2009. At 3,500 miles the brakes on the 2009 tdi began making a high pitch whistling noise at slow rolling stops. After a couple of stops it would stop and then reappear after the car had been parked for a couple of hours. I called the dealer, and was told that it was normal and should eventually stop. At 7000 miles it still whistles. I took it to the dealer for inspection and was told that rust was forming on the rotors and the whistling sound was the brakes scraping the rust off. I was told that my brakes were fine. I asked if this was a problem I would have to live with, whistling brakes for the life of the car? how embarrassing to own a new car and the brakes whistle when you pull up to a stop sign. I called vw America and was told that they couldn't tell me anything. They depended upon the dealers to provide them with issues/concerns. Neither of my previous 2004 or 2006 Jetta tdi's brakes whistled. So vw is this normal? if so, then I have purchase my last whistling Jetta.

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