Makro/Defy o reply on broken oven

On the 1st October I bought a Defy oven and hob. Got it installed and was very happy. On the 12th of Dec, the oven stopped working. Only the cooling fan switches on when trying to use it. I contacted Makro and to this day have not received a reply. I then contacted Defy directly and after a big strugly I could tell them my problem. They said they will contact me later. Also to this day they have not contacted me back and in the mean time I have an oven that is not working. Can you please look into this.