Defy - horrible service

I bought my defy oven last year February 2021, it was installed March 2021. I used my oven and it just went dead. I went to where I bought my defy and was told it has a 3-year warranty. They phoned defy and they told me it would take 3 days to send out somebody. Being a single mom, I need to cook for my children, I got out an electrician just to check if it was something small. He only tested the fuses and said one was dead. The oven then worked for about two days, then it went dead completely. Some of the wiring isolations were damaged and I asked the electrician to tape it with insulation tape as it is a hazard for my home. Today a technician from defy came out and asked who opened the oven, as he saw the insulation tape, I answered him that an electrician checked for me and only changed the fuse and taped the damaged wires for me. He was very arrogant and said that my warranty has now lapsed and said that he now needs to go back to defy and find out if he can fix it. How am I supposed to make food for my children if I need to wait for three days for somebody from defy to come out and why would a new oven have damaged wires? The guy from defy said it is a good oven and they don't get any complaints about this oven, whereas if you google the oven there is tremendous complaints about the fuses and fan of this oven.