No help from Defy ..

I purchased a Defy electric stove from House and Home. The stove is defective. Defy is insisting on a repair. I found the fault within in 1 month and would appreciate a replacement instead. no joy from Defy who are supposed to be a tried and trusted name. I'm still trying to get this resolved 1 month later. Its the festive season... and guess what defy. I have a stove which cannot be used