Sorry to hear about your issues. Sucks that warranty work seems to always take a back burner.
I've gone the lemon law with GM in the past. Each state is different in what they consider a lemon.
Find a good lemon law lawyer and ask questions on what your options are. They will take their cut out of what you get back from the manufacture.
In my case, they depreciated the car from the original price for the mileage it was driven. After everything was said and done, I turned the car into the local dealer, Car got paid off, lawyer got his money, and I wound up with several grand in my pocket.
Sad part was after all the complaining it took for me to even get them to look at the car, and the BS I had to deal with, GM called me trying to get my business back and offering some rebates on a new car. I told them I didn't care if they gave me one for free, I'd burn it to the ground in front of them. They lost a long time customer. I won't buy another GM product.
And here I am now with a RAM.
Good luck with your issues. Seems the true mechanics are a thing of the past. All we have now is mostly button pushers who follow a script and don't watch the screens to see what's happening.
You could see if you could have your truck moved to a better dealership, but more than likely they wont allow it since this one has already started working on it. Been there, done that.