Engine was leaking oil now the problem is much worse after dealership did the repair

The vehicle listed above had issues with burning oil because when GM made the motor they put the wrong piston rings inside of it. Therefore, I took my car into a Chevrolet dealership and I didn’t care about price I just wanted it done and wanted it done right. They were supposed to rebuild my motor completely. It only took them 8 days which was extremely interesting and I ended up only paying $3,000.00 which was even more interesting... anyways I start the car after I got it back and it’s 1,000 times worse then when I dropped it off. It looks like they took my brand new brake pads, rotors, and brake calipers off my car and put junk ones on it. Along with my exhaust is now rotted out, broken in 3 pieces and pouring out fluid underneath the car. Then after starting it and listening to it, it has a timing chain slap. Also, there is burnt coolant in the oil which they claimed was “fresh” oil and all over the motor cover. There is a two year warranty on it and I never want them to touch my car again. What could this possibly be? Am I better off replacing the whole motor? Also I must add it doesn’t not over heat.