Chevy 4 Life

So here's my story....one morning started up the Equinox and the most annoying high pitched sound started coming from the speakers. No other chimes or sounds worked, not even OnStar; I thought maybe it was the amp. Took it to the dealership Paradise, and they started doing their investigation after I told them about the issue and what my concern was about the amp. Guess what......4 days later and numerous troubleshooting calls they finally say it was the amp....uh..duh. $1000 to pay for someone to get on-the-job-training for troubleshooting. The amp is around $250 brand new, and $100 used on ebay, so you're saying labor is worth 3x the price of the item to be replace even after I mentioned what the issue was. What a crock......I'm now changing my name to Chevy H8R 4 Life. Been screwed over enough by GM, and enough is enough!