Walmart review: Oil change

I have a 2008 chevy silverado that I bought with higher mileage … I had my oil changed many times in the last year to take care of my beautiful truck. Usually it was at mountain home wal-mart, but recently had it done in flippin wal-mart. The next few days the truck ran rough, then the oil pressure light came on and had to pull off the road. After checking it out I had no oil.. On the side of the road I waved someone to help. Got some oil back in it and drove it home. The next day had oil all over the place. In garage and drive way. Contacted automotive dept and the manager said his new employee screwed up and put a screwed up oil filter on it which caused it to loose all the oil. They changed the oil again. The problem is the truck runs really rough and the cooling fans run all the time, and noise that wasn’t before. I know the engine wasn’t the newest, but now it’s the worst! I feel wal-mart was negligent and should replace my engine. I’m scared it won’t be long before it’s toast and overheating. I recently am disabled and now no way I can afford a truck. Please help!