Pathetic service - with a Dysfunctional Vehicle

Im really not happy with the service I have received from SA TAXI ( The Dome ) , bought a taxi on the 28th July , this car is constantly giving me problems … I reported this car and was told that a part will be ordered and ill be contacted , I’m the one who must always make follow ups , right now this car got stuck in Free state with passengers due to being slow and cutting petrol all the way , my driver had to call someone to take those passengers and managed to come up , filling petrol frequently , I have lost money on that trip and SA is expecting their installment in October , how can I pay the car installment with a car that is not 100 % functional , this is a business car when ever it gets stuck is money , secondly I was given the expired road worth certificate , when I went to traffic department I was told that I need to take this car for testing , ( Another time consuming ) I took this car and paid R1000.00 for testing … question is why was I given the expired certificate at the first place … when I called the lady Lolitha she told me that I can bring the taxi they’ll take it for testing but it will take time , unless if I take it myself then send them the invoice they’ll refund me .. I’m really not happy with all this and want this Taxi to be sorted out ASAP as is for business . Hardly 1 month and the car is constantly giving me so many issues