Review Unethical business practice

I am extremely disappointed with how Kia Roodepoort treated after I had an agreement to buy my car but they have been taking me for a ride until I took the car back but guess what they have changed the car into dealership stock without paying me first and misplaced my service book which makes it hard for me to sell the car on my own. I have never seen such incompetency were people don't even know their own process. I regret doing business with them ?