Warranty Pamphlet/Booklet Invalid

I bought a Defy DGS606 Gas stove with an electric oven from Hirsch's Strubensvalley. Had the electrician connect the electrical part of the stove. Baked 2 x cakes in the oven and it worked perfectly. On the third try, while in use, the oven switched off. Got the electrician to re-check the connection (because it's the electric oven that's faulty) and all in order, therefore the oven of the stove is broken. I contacted Defy to request assistance to which I was refused assistance because according to their terms and condition which ISN'T stated on the Warranty pamphlet received does it state that the Warranty is valid based on a Compliance Certificate received on the installation of the top gas burner. Defy is NOT adhering to their own Warranty terms and Condition, that are verbatim on their website. The customer Care is sticking strictly to their undocumented policies and procedures and refusing to adhere to Warranty terms and conditions provided within the product box.