Refusal to repair a 2 week old car (Group 1Hyundai Midrand)

I purchased the vehicle from Group 1 Hyundai Midrand and collected on 15 June 2018 from Manfred Krige (Sales Executive). Vehicle arrived in Nelspruit the same evening, Mr Mokoena collected vehicle from me the same evening. On 29 June 2018 the vehicle broke down and was towed to Hyundai Nelspruit, where they discovered the clutch had failed and needed to be replaced. This is after traveling for 1 655km with the vehicle. Spoke to Manfred at Group 1 Hyundai Midrand, he sent an email stating that they contacted the Nelspruit Hyundai technician and concluded that the vehicle was damaged because of customer abuse and that they would not be liable for the damage. I tried making contact with Celeste Da Mata the Dealer Principal at Group1 Hyundai Midrand both via telephone and email I had also copied the Used Sales Manager Pierre Topliss. He responded with the same statement, they will not be liable as it is customer abuse. I asked for a copy of the check they say was performed on the vehicle on Thursday 19 July 2018, did the same on Friday 20 July 2018 and again on Monday 23 July they still haven't come back to me. They read my emails but do not respond, this was a used vehicle I purchased from Group 1 Hyundai Midrand. I would accept and understand them refusing to pay for these damages if the vehicle was brand new when purchased. We haven't been in possession of the vehicle for longer than a month or more than 2 000km prior to the clutch failing.