Pathetic and poor defy service

Appaling service from Defy. I purchased a 5 plate gas stove and electric oven in March 2021. Towards September of 2021 we started noticing that the oven burns all our food and cakes. When i say burn im talking pitch black. I still didnt realise something was wrong. I just assumed i didnt know how to use it, however it got worse and worse. I logged a few calls with defy and their turnaround time was usually a few days. They have been out a few times and could never find the problem. Ive asked to check the thermostat which was never done. Eventually our electricity started tripping at home, we got an electrician out who did a rewire and found the geyser to be blown and our fridge motor packed up due to electricty tripping which the electrician confirmed is the oven. I called in again they came out and checked again. Nothing was done with the thermostat but they confirmed the oven is working. Only for me to test that the oven is workinf by putting pizzas in the oven when i heard a loud bang. The glass door on the inside of the oven burst. I called again, but this time i called the store where i purchased to unit to ask them to speak to defy. Which they did. A few days after a technician came out, finally replacing the thermostat and the glass of the door. The oven works then only for 2 weeks ago to discover its not working again and the door hinge is broken. Which i also complained about on previous call outs. A tecnician came out 2 days ago and said some wire burnt out. Replaced it. Now i am sick and tired of this unit which we only have for more then a year that is giving us endless problems. Never mind the money we spent for electricians and replacing our geyser. Defy doesn't want to replace their unit. I have requested numerous times. Nobody is willing to assist us. The glass pieces of the door that burst is still laying at the bottom of the oven which we cannot get out. I want a replacement unit and nobody wants to take responsibility. Clearly there was something wrong from the get go. Its alot of money wasted and still we sitting with this unit which can break anytime for what reason i dont know. Its not like we using this oven day and night. All i ever wanted was to get the benefit of this unit which ive paid cash for. I mean R12000 later. Defy this is unacceptable. Your customer service is so poor. I regret the day i bought this brand