Melrose Nissan/MMI - Unsafe and Non-Roadworthy Vehicle Sold to Me by MMI

I bought a 1998 Jaguar XK8 at Melrose Motor Investments (MMI) in July 2018. When I purchased the vehicle I was told that there was previous faults on the car caused by the previous owner but that all faults were repaired by MMI. I was provided with an invoice listing the items that were repaired. The car is not a daily drive and mostly only driven on weekends. I could feel that the car was not easy to drive and felt unstable on the road. I decided to take it in to Jaguar for inspection. To my shock I was advised by the mechanic that the car was not to be driven for my own safety and was not road worthy. The timing belt was about to break, the control arms was about to break, the shocks were pretty much non-existent, the car was leaking oil and coolant and the gearbox mounting was missing. The mechanic at Jaguar questioned how this vehicle passed road worthy inspection as it was dangerous to drive? I had the Jaguar dealership perform a full inspection of the vehicle and was advised that it would cost over R100k to get the vehicle roadworthy. When I brought this up with the dealership the person I was dealing with from the start advised that I can bring the car in and they would send it back to the place they used for the repairs as the repairs they performed were under warranty. The problem that I explained to the sales person was that the faults on the car was different to the faults they were willing to have repaired. I am now unable to drive the car, have to pay the monthly installment to the bank, can not sell the car due to its age and condition and need to spend another R100k just to get the vehicle in a safe state. I have already spent over R20k on repairs on the vehicle. The repairs that MMI are prepared to make will not make the car safe to drive and they refuse to take the car back and give me a refund on my purchase. I also cannot lodge a complaint with the ombudsman due to the age of the vehicle. I feel betrayed and **** to and I have been taken for a ride by this dealership resulting in significant financial loss on my side.