Vehicle Purchase

My wife purchased a vehicle from Autoteam Menlyn at the beginning of January 2018, everything went fine and the deal was handled fast and efficient, after driving the vehicle for a few days after collection (12/01/2018) I had contacted the dealer to report that there was a fault with the vehicle(15/01/2018), the dealer arranged for the vehicle to be collected(17/01/2018) and repaired this was exactly 5 days after we initially collected the vehicle. I was told the vehicle would be checked and repaired. 1 week passed and when I contacted the dealer they told me the car was being looked at and that I should expect the vehicle the following week, when I called back within the week I was told to expect the car, I was told that the vehicle had only THEN gone in to be looked at and that they were busy with it. After another week I called again and was informed that the car had been taken back to the manufacturer to have the gearbox fixed. another week had passed and when I contacted the dealer , this time with my patience having been worn thin I was told by the dealer that I should be patient as they are paying R12000 for the repair. When I last enquired (Friday 09/02/2018) about the vehicle I was told that the car has been fixed and will be tested for the weekend and Monday (12/02/2018) to ensure the repair was successful (Awfully long time to test a repair in my opinion, but fair enough at least I had a proper timeline). When I had not heard from the dealer on the Monday, I again contacted them only to be told the vehicle MIGHT be ready for the DEALER to collect on the Tuesday (13/02/2018). The vehicle has been "In for repair" for just over a month now, the dealer did provide us with a loan car two weeks after the car went in for repairs, our frustration lies in the fact that we cannot seem to get an accurate timeline for when the vehicle will be done and it seems as though the dealer is purposely delaying and not being transparent w.r.t what is going on with the vehicle, constantly extending timelines, at this point we are considering cancelling the entire deal and demanding a refund for all deposits and fees paid as this is truly not how business should be conducted. It seems to me as though as long as you are buying a vehicle they are happy to accommodate but if the vehicle has issues then you (The customer) are put on the back burner and are forced to fight for answers and all you get are excuses.