2016 Jeep Cherokee electrical system problems

On july 18, 2018 I went outside to get an item out of back of my vehicle which was stationary and I couldn't get liftgate to lift and I noticed there was smoke in my car, I opened the drivers side door and smoke billowed out. After a few minutes, I got in the vehicle and moved it back away from my house and noticed I had no A/C, radio or anything working on dashboard. I looked in back of vehicle and it was burnt in the back left corner of lift gate.

Three days after buying this jeep cherokee limited I was sitting in my driveway with the car in park running when I started to smell something burning, the cabin filled with smoke to the point that I called 911 and dispatched my local fire department, they could not determine the location of the smoke, I was able to drive it to the dealership with all windows down in 18 degree weather, the dealer found "burn marks" on the cabin air filter and all they did was to remove the cabin air filter and that was it?