FURIOUS CUSTOMER

I bought a car (Chevrolet Cruze 1.6L) from this dealer and traded in my Polo 1.4. I was assisted by Tanya During. The experience that i had from them its overwhelming. 3 months later i realized that the car was involved in an accident after i took it to service. I fount out because i wanted to change the front right light and they told me its not possible because it wasn't the original light. I call Tanya to confirm and she said she was not aware of that. After 3 months the car broke down, i fixed it. Few months later it broke down again, same problem. I then tried to sell it through we buy cars, they told me the car has been badly injured and i will loose badly on the deal its better to take it back to the dealer. When i got there the manager said there was nothing he can do to assist me and the car drives fine by only looking at it. I am so furious. I mean how can an almost new car that i bought with 16 000 km on clock gives me a such problems. They never even send me my contract after signing... i don't know how many times i have called for it. I don't even know how much they charged me for trading in my Polo.