AutoNation Chevrolet West Austin

I had a scheduled 15000-mile oil change, second for my new vehicle. Both completed at AutoNation in Austin, TX. Upon returning home, I checked the oil level and it was 2.5-inches ABOVE full level. I proceeded to begin draining oil, only to discover that the oil drain plug hex (15mm) was sharp, burrs, gnarly, abused. I drained 38 ounces of oil (more than one quart) to bring it down to the full level. The oil appears dark and dirty to me. The "Next oil change due" tag was filled out to be due the day before this service change was completed. So my tangible evidence (I retain all of it) of more than a quart of dirty oil, incorrect service tag, and damaged hex on the oil drain plug, have completely destroyed all confidence and faith in the AutoNation/Austin service department. I now do not know if they changed the oil, or if they changed the filter, or put in the correct oil type. I don't even know if this is my original oil drain plug, since this is only the second oil change and shows such wear and abuse (looks like a Vise-Grip or Channel Lock were used on it). I visited the service department to speak with the mechanics shop supervisor, but was told he was in training and that I could wait until it was over. So I left after attempting and failing to buy a new drain plug from the parts department I still have four oil changes available to me as part of my purchase plan of my Equinox from said AutoNation. I cannot allow my new, one year old vehicle (2022) to be put in this level of danger as over-filling the engine oil can cause seals to fail. Too bad. I had looked forward to two years of not having to change my oil, but now I am forced to change my own oil again. I bought a new drain plug from Carquest, researched oil filter part numbers, correct oil, and will be changing my oil before the week is out. Totally disappointed, and talking to all my friends about the day I had. Herb