Gateway Kia of North Brunswick

I had 2 kids so I knew it was time to get a bigger car. only went to kia because of my bad credit. I got ripped off big time!!! got a used Sorrento with 58k on it. 25% interest rate and put 6 thousand down. shortly after getting car i was told that it was in a severe accident and needed a few grand worth of work. When i confronted the dealership they said its not their problem. I recently tried to trade it in, they cant help me. i need a co signer. they approved me with a 450 credit score, but now my credit is a 600 and they cant do anything for me. I have contacted them numerous times to correct the issue at hand and been ignored or yelled at each time. Im done, i just contacted a lawer.