Dawson Auto & Cycle

well I took my truck to a real mechanic unlike the one at Dawson s where i got my truck and they told me not only is my transmission shot but my rear end def is shot to and they said it was done before I even purchased the vehicle. Its going to cost me $4300 just to get them fixed, its pretty much what I need to pay the truck off. So im stuck with a big decision should I fix it or just let it go back? I need a vehicle there is no doubt about that and if I let it go back I am going to be messing my credit up and they will just fix it and sell it to make more off of it. I called them and told them what I found out and how upset I was about what they did to me they really did me dirty and I pray no one goes through what I have with these people they will never get my business again. I purchased the vehicle 03/2012. It broke down on me 06/2012