DEFY not honouring their warranty

I purchased a Defy gas hob and electrical oven combo at Hi-Fi Corporation in November 2022. The oven has since stopped working and the oven is still under warranty. We have tried on numerous occasions to get Defy to resolve this problem. Hi-Fi Corporation logged the call at the beginning of June 2023 and we received the following reference HF_DEFY-2023D***, the Defy technician came out and confirmed that the parts needs to be ordered and it will take a maximum of two weeks. After 2 weeks I kept following up only to be told that they cancelled my case due to the fact that they could not get hold of me, which is not true as I can provide my phone records as evidence that I never received any phone calls from Defy. We retried to log the case and now suddenly the excuse is that we must provide a COC for the gas installation which firstly does not make sense that this is only noted two months after our query and secondly due to the fact that it is not the gas part of the stove which is the problem, it is the electrical oven which is the problem. It therefore seem more likely that Defy is looking for an excuse not to honor their warranty. This exact information was also sent via e-mail through to *** on 25 July 2023 and have not received any feedback. The service of Defy is utterly useless and I will not recommend them at all.