Ford Brits sold me a faulty car

I bought a car at the above-mentioned car dealership on the 01 September 2017 but o the 10 October 2017 I noticed the car has problems, I immediately went to them to notify them as I believe it was to soon for me to be busy repairing a car a bought a month back, they booked the car for repairs for the 25 October but I feel like the car is going to give me more problems in the future so i decided to take another car at the same dealership but the manager"Steve"is giving me a different story every time I go there and this really makes me wonder if he is doing all this because i'm a woman. The manager now says if I decide to go ahead to take another car they are going to take R20 000 plus from the amount that I deposited from "their faulty car". It has been two weeks now I'm back to travelling using public transport but they are busy debiting their monthly installment