Makro and Defy no response to 3rd service call in less than a year of purchase

I bought a defy stove at Makro just over a year ago. Within the first month it was faulty and something had to be replaced by defy. A couple of months later another item had to be replaced. I currently have not had a stove for a month. Logged another call with them to say the stove is not working, had to call them again to check up. Still waiting for a response. I told them to call me because their emails are not coming through to me, which is awkward because I receive the promotional ones. Utterly disappointed with the service from both Makro and Defy on this matter. I cannot repeatedly check in on the same matter with no feedback. They can take their stove and give me my money back