Need help

I am so angry I just want to commit suicide. Auto Vision and his salesmen put me in a **** predicament and I don't know how to get out of it. When I canceled the deal with them they ignored me and send another car for me to drive until they ever sort the problem out. They never did and I am paying for a car that I am not happy with or have. Why in God's name is it so difficult to get stuff canceled at Absa. I have lots of problems and my salary is R5500pm.