Recreational Vehicle Lpg Tank Valve/gauge problems of the 2006 Chevrolet Impala

My car had been showing the service battery charging system for about two days. When I called southeast kia of somerset, they tried to say it was the actually battery, keep in mind, I have only had this car for six weeks. I knew that it wasn't because I had been having no problems with my car whatsoever before this, and I was raised around mechanics and truck drivers, I do know a little about cars. When I turned the car off it would not start back up. I had the battery jumped three times and it died sitting there, we finally got it charged so that I could drive to my mothers, but had problems on the way there. As I was driving, all of my gauges completely stopped working in my car, and I thought the car had died and that I was coasting. So I pulled over to the side of the road, with my three children in the car, and realized the car was running. I shut the car off, but it kept running. Now, kia is saying that if it's the altenator it's not covered under a two year warranty that I have, because they don't want to have to fix it basically. I have been severely ripped off, and now me and my children are without a car. I think it is ridiculous that car lots are able to send out terrible and unreliable cars to people without a second thought, and then don't want to fix things. Now I am trying to find a way to get a different car and leave this piece of junk on their lot, I will probably never buy a car again unless it only has about 20 miles on it and is brand new, and will definitely do more research on the type of car, along with the dealership selling it to me. And kia has not heard the last of me as well.