Goods not delivered and abusive staff member

During the Rand Easter show of 2015 I purchased a BMW 320i from Grand Auctioneers. I took delivery of the vehicle the day after the auction. The vehicle wouldn't start the next day so I had a mechanic have a look at the vehicle. I was told that the vehicle had been in an accident. This was not revealed during the auction. I also had to chase Grand auctioneers for the papers for this vehicle for many weeks. I chatted to Farook who was the auctioneer at the time and he offered to have the vehicle swopped for another vehicle of the same value. I had the vehicle towed at my costs to Grand Auctioneers and provided Farook with a copy of the invoice. It is now more than 2 years and I still haven't received a vehicle from Grand Auctioneers. Neither have they made any effort to reimburse my money. Farook no longer works there. I've been communicating with Ismail for 2 years and Kiran since 19 September 2017. The vehicle that I returned has been repaired and sold without my consent. I still have the papers for this vehicle so the vehicle still belongs to me . Ismail now tells me that he will give me R15 000 less for the vehichle in lieu of repair costs. I did not give consent to any repair cost. This morning I was verbally abused by Kiran after he didn't have a vehicle that he promised ready for my collection since 25 August 2017.