East point rentals abuse

Hi i have took a car with east point rentals in December i have been paying it according to the way my contract stipulated. On the first week of taking a car i was told to test drive the car and if i find any problems with it i should return it on the very same day the car was shaking and consuming alot of petrol i took a car for a drive to home in mpumalanga i immediately told the sales man who was helping me get the car that the car is giving me problems i did the test drive and all. I sent them two emails telling them the car is giving me troubles after i called the sales guy to follow up on my case they then called me and told me i have to bring back the car at my cost meaning it is my problem that the car failed on me. I told them nicely that i was not comfortable driving a car in that condition and it uses too much petrol which i had to borrow money so that they can go fix it. they told me thats the only way i have to do all at my cost bear in mind in was in a period of finding faults with the car. I took in and they fixed it they then demanded a payment which i told them how can they want a payment of a car that was not road worthy they threatened me that they will take it i then made a payment of 850 saying it is for kilometers i traveled today they call me saying i owe amount of 1975 since well i made a payment on a public holiday that will have to reflect on the following week which the same following week i paid and immediately sent them proof of payment they say it is my banks fault that this is happening to me and that i should make a payment by tomorrow or they coming for the car. They gave me a s**** of the car to start with and two contracts which one is for 3 years and the other is for 5 years asking me to top up with a 1000 rands now they claim i owe them. I asked the lady if the new rule they now telling me about if it was in s contract exist they said no but i have to come to the office so they can explain to me i had been harrssed and threaten by this company for days now. I am emotionally and physically tired of being bul**** by s lady call noori please help me sort out this matter or get my deposit back since all they do is give me troubles and threats always