2017 GMC Canyon (coolant leak?)

Hello and good day, two months ago I purchased a 2017 GMC Canyon with 53,000 on it from wilsons . It came clean and mean with no issues. I recently got my first oil change at Bennetts Cadillac Chevrolet Gmc, since I have owned it as its my first finance and vehicle. It was about 5-6 days and then yesterday my oil was all over my building parking lot, all over my good friends new home he just purchased and it lead to My truck was being towed to Bennetts in Cambridge where it had its oil changed. The tow truck drivers opinion was the drain plug was lose or
Cross threaded . I was not sure. I was full of stress and anger. So I went to bennetts hot headed... as i have not had good treatment as a new customer since day one which is another story and i can admit i should have been calm and not been so frustrated but i have to pay alot of money for that truck and i love it . So after i brought it in through warranty i had a rental for a day, i was stressed out , as its to much to deal with so soon i feel but i do know stuff happens. So today I picked up my truck and was told they didn’t do anything wrong, the oil filter was tight and the drain plug was fine and that they only needed to add 1 litre of oil and the real problem was a blown engine coolant line and I began to question it as I had driven it while it drained alot of oil to the point i would believe it was harmful to the engine . So i kept questioning and getting nothing but it was a mechanical failure . So i had to bite the bullet and hope thats what it truly was . After that I received my paper work, Myself and the service manager agreed to disagree in a conversation where I explained why i was so upset as I had been there and only there 4-5 times since I got the truck and they wronged me the very first time about reset the windshield which was covered but I was told otherwise Until it was to late and done else where. Then how the dents happened and they did nothing but deny it mean while my truck is monitored by camera at home. I dont use it for work and Im overly careful. Only people who have touched it and driven it aside me is Bennetts employees , Bennetts car wash which Ive never chose or asked to use as the only other time It was there was for running boards i had replaced as the coating did not hold up. My questions to you GMC owners would be
Is a blow engine coolant line common or known under 60,000 kms? Would a burning plastic smell be normal. (keep in mind the photos that will follow) dont seem to match up with what I was told at bennetts) also I need to know if I’m crazy for being so cautious and caring about my GMC. I wonder about the one litre they claimed was needed . I wonder if the engines ok . It had been driVing for 3-400 kms until this was.m noticed. The dipstick was also coming out dry so i dont see how it adds up. but I am also giving it time and im going to get a second opinion .