Very bad experience

I had a very bad experience with this whole rent to buy thing I got a car from a dealership in Welkom Geraldine Auto and from there it was only downhill. The car broke down within the first 2 weeks of having it, it went back to the dealership after standing for nearly 2 months at a workshop in the town where I'm staying (I don't stay in Welkom). After it came back I drove for a week where it broke down again. I then took the car to Bosch Service to take a look... There words was that the car is very unsafe and they don't even know how it went thru the roadworthy test. Everything was wrong. Planet did refund me my payments but my deposit is not refunded and I really had a bad experience there is no communication from them and they took money out of my account again this month and I don't even have the car. I really think I was taken for a ride and Planet must give my deposit back.