general problems of the 2012 Dodge Caliber

I recently brought a used vehicle, when I took it for a test drive everything ran smoothly and things were working just fine, no problems. I drove the car home and when I got out the vehicle and tried to use the keypad to lock the doors, it didn't work and actually started the car than the alarm went off. I had to start the engine and shut it back off and manually go and lock all doors because I also noticed the lock door button on the door did not work but the window buttons does. I immediately called them and informed them of the issue that I was experiencing. About 1 week went by and I started to feel the car dragging when trying to accelerate as well as the check engine light and gas cap light coming on. And most of all I noticed how quickly the mileage was moving versus the mileage I signed it at. I also called in and reported what I was experiencing, they suggested I bring in the vehicle to a shop they contract with to see the problem and resolve it. I took the vehicle in on the next available day for me for about 4-6 hours, I was called back to pick the vehicle back up. The check engine light and gas cap light was off but nothing else as far as the electrical problem within the car, and the dragging feeling as well as the mileage troubleshooting. I wasn't satisfied with the work that was done, so I called again to report the troubles and request for a refund because I was not satisfied with the vehicle and how high the mileage goes when I only drive 25 miles back and forth 6 days a week. I've had the vehicle for 8 weeks now, and this car maintenance is poor as well as I have a strong feeling the cars been tampered with because of the damage to one of the vents in the car on the dash board, as well as the car needing an oil change already and I only had the vehicle since March 20, 2020.