Side/rear Glass problems of the 2013 Volkswagen GTI

I purchased my Volkswagen Gti March of this year. During ownership, I had the windows tinted and each time it was serviced by the dealership subcontractor, the windows were scratched. The door glass and rear window was replaced with the rear glass quarter being replaced twice. This was not the safety concern, but it leads to my main concern; the windshield. The glass of the windshield has now started to chip excessively. There are at least 40 chips that refract light during driving and it has been getting worse. I have taken it to the dealer and they state that it is "normal wear". I have contacted Volkswagen of America with no response. I have never had this type of glass issue with any vehicle I've owned, and I have owned nearly every make. Please advise.