Assist problems of the 2019 Hyundai Elantra

I was driving home from work at night when my 2019 Hyundai Elantra sport (just found out has the wrong VIN) lost all power and felt like it wasn’t running on all cylinders. I switched it to sport mode had a little more power for about 2 mins then my car died completely. I had to pull over thankfully I made it to the bottom of the pass and coasted into a gas station while I waited for a tow truck to have it towed to the dealership. The dealership had my car for almost a week. They ran all kinds of diagnostic testing, one of which came back showing my engine lost almost all compression. Secondly they ran more tests and more tests and just to tell me it was a bad battery. The battery has been replaced. My car is still having idling issues, it’s shifting hard and the lane assist which I kept on just the warning turns itself on randomly, same with the front assist. This vehicle has 37,000 miles on it. Maintenance has been done regularly along with the highest quality oil changes, premium gas and air filters. I am pissed that I am paying so much money a month and am having nothing but issues.