Atrocious customer care

I had my iMac repaired for R20,000. I collected the repaired unit on 25 March 2020 just before the lock down. When I got home and tested the unit it was still not working. I advised the repairer immediately and returned the unit in July once South Africa entered level one lock down. Core Group refused to make good on the original repair stating that the warranty on the parts they used to repair the unit had expired and that I should have returned the unit before the warranty expired. My argument is that I advised them of the faulty repair immediately and that the parts they fitted must have been faulty when they fitted them. I have had no use out of the device and might as well have flushed R20,000 down the toilet instead of trying to reason with Core Group.