Wiring problems of the 2019 Volkswagen Jetta

I purchased the 2019 Volkswagen Jetta in December of 2018. The vehicle currently has roughly 50k miles. When the incident occurred it had 38k miles when I first noticed a weird smell coming from my air vents. I was currently driving on the highway when I noticed that smell, pulled over and opened the hood too the vehicle and noticed that the battery had exploded!! I right away contacted Volkswagen customer care and notified them of the incident that had just occurred to me. They mentioned I had bumper too bumper warranty, so I took in the car too the dealership and had to pay out of pocket because they mentioned that the battery was no longer covered. The new battery that was replaced isn't the original one that came with the car when purchased. I also mentioned too the service tech that air bag , abs, brake booster, cpu appeared on my speedometer. The dealership had the vehicle for about 2weeks and also noticed that the acid from the battery had melted down the wiring harness, ac lines, and suspension components. I'm currently still dealing with customer car because nothing was done from their end, everyday the car has a new issue, I call and all they say is too take it back and they'll take a look at it. I purchased this new vehicle so I wouldn't be dealing with any of these problems but it turned out to be worst!! I no longer want too deal with the dealership because I get nothing out of it, I would appreciate it if anything of this could help me out in any way possible!.