Shocking Service or lack thereof from Durban South Toyota

My son who works abroad, purchased a second hand Toyota Corolla Exclusive 1.8 A/T vehicle from this so called "reputable car dealership" in January 2019. A warranty cover was purchased at the time of the sale agreement to give my son peace of mind in the event of mechanical failure. The salesman, Simon, was in constant contact with my son to secure the sale. Just over a year later, the gearbox malfunctioned. My Husband who is the driver of the vehicle, contacted the dealership and the vehicle was towed to their premises for inspection. The vehicle has been with the dealer for the last 6 MONTHS, from the second week of June 2020. Numerous follow up calls had to be done by my husband and myself to enquire the progress of the outcome of the warranty claim. To date we have not received anything in writing detailing their findings for the mechanical failure of the gearbox. Instead we received random calls with ridiculous quotes like R63 000.00 as cost of repairs, bear in mind, the selling price of the vehicle was R121 000.00. During one phone call from the mechanic, he told my husband the oil in the gearbox was black and that confirms their was a underlying issue prior to the purchase of the vehicle. When my husband disagreed with the amount quoted, weeks later a different amount was quoted R25 000.00 A claim was submitted to the insurer in September, 4 months after the vehicle being in their possession. The insurer sent a claim rejection with reason "no feedback received". Upon contacting the insurer, they confirmed the dealer had 2 claims open. One was from the dealer which they failed to close and the other was from Gear and Diff Specialist. I have tried to contact the dealer Principal to no avail. He is never available to take calls. I tried to speak to Simon, the salesman. My son sent an email to Simon and a week later, no response until I sent another email asking for feedback and a follow up call begging for a response. Nothing came out of the email or our repeated requests. I requested to speak to Simon's manager, left messages, and received no call back. I managed to speak to Keegan, Workshop Manager, to date no feedback from him either. I called again last week and managed to speak to Simon's Manager Lisa, who was extremely unhelpful and seemed to absolve herself of any accountability and instead said if the vehicle is in the workshop, its the workshop manager's responsibility to call us. I also mentioned that according to my son, Simon failed to sufficiently explain the warranty cover. It has been an absolute nightmare dealing with this dealer. Their after sales service is non existent and it seems once the sale is done and they have been paid by the bank, the customer is forgotten. My son has been paying for a vehicle that is in the dealership premises and they frankly don't give a damn. All we want is for the dealer to take responsibility and to have the vehicle repaired. I will never recommend this dealer to anyone and Toyota South Africa should definitely reconsider them as their business partner.