Brake Disc Caliper problems of the 2015 Chevrolet Silverado 2500

2015 chevy Silverado 2500 hd VIN # (xxxx) purchase my truck new in 2015. The truck now has 14,400 miles on it. I notice a few weeks ago that the brakes didn't feel right. I pulled the wheels and noticed that the rotors were grooved and excessive rust build up. Two of the brake pads were worn down to the metal (one in the front and one in the rear). I pulled the rotors and took them over to be turned down. The mechanic at the garage told me that they could not be turned. Reason being that some outer metal was worn down to a softer metal and could not be turned down. I replaced 4 rotors and pads and the two front calipers, the rear calipers seem to be ok. Then I went over to the local cevy dealer to see if there was a recall on the brakes for this problem. They said no the reason given is that they don't guarantee against rust. While researching this on the internet, I discovered that its just not my year vehicle 2015 having this problem but goes back to 2000. How can you say that this is not a safety issue and not have a recall for it. And by the way my truck is kept in my garage all the time. So exposure to the element is not an issue. Parts of this document have been redacted to protect personally identifiable information pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

(1) I purchased my chevy Silverado 2500 duramax z71 Sep 2015 at the dealer rydell automotive group in northridge California cat first the steering was heavy at times when I would make a 3 point turn or if I was backing out of a parking space and then moving forward. (2)alarm chimes are extremely loud in vehicle upon entering vehicle and during alarms despite adjusting volume to lowest setting in the settings menu. Happens whenever the alarm chimes. Since Feb (3)Jan 10 2018 took in for squeaky brakes at the dealer they told me my caliper was bad notice that my inner brake pad didnt have life but outer brake pad still have life when ahead with the repair . Same this yr March 25 2019 took in again for same issue told me rotors where done need to replace them and brakes contact gm and told me and repair service it depends how he turns.