Fly by night electricians

During July 2024 I visited the Barnard store on Ontdekkers road trying to find help with fixing my Defy stove. The issue of the stove was that the plates were not getting enough heat. When i got there i met ladies and a very knowledgeable gentlemen who is the owner of the store. i told him my problem and i told him i am thinking the stove plates are old. He suggested to send the electricians to come check it and added that it could be the nobs. the agreement was they will check the stove do a analysis of the problem then let me know if i am willing to fix it. Two days later the guys called but i was not home. i called back a day later whereby they told me the technician will come later. The electricians only came about 8pm the guy did not do proper testing. All he did was turn the nobs said is the plates. Changed the old plates and the stove was not fixed . When he tested the stove the stove was overheating on the plates they left promising to come back. i was charged R1500 for the replacement and the call. i complained the next day for the guys to come fix the stove and i was told i need to buy nobs which will cost me another R1200 the issue was not the plates. i asked them to return my plates and bring nobs which never happened. i then visited the store a week later to show the even the oven now is burning the insulation. the only issue the stove had was the top and we still could cook. the oven didn't have any issues we baked. At the moment we cant use the stove at all until they fix and they refusing to fix it i went to the store couple of times nothing is happening even today. i have no money to put the nobs and i need this house rented out but the stove is delaying the process. The questions i ask how to you do a diagnosis by just turning the nobs and give a solution. i am in a loss of R1500 my stove is not working as usual so all i ask is my plates back and the stove to work as it was. Cause buying another nobs is more or less me putting a new stove