Heart break Experiance

I bought a Defy stove from OK furniture in June 2017. Since the second month I bought it I never enjoyed this stove as I have been logging a call after another for Defy to fix the stove. Now I want them to take this stove and bring me the new one but they seem reluctant to do that. They want to come again and fix it. I do not want this stove anymore its either they bring me the new stove or refund me. Buying a new stove for cash and never enjoy it is not good at all. I feel regret buying a Defy item. The reference number for my last log is 920479.