Malfunction microwave

I bought my smart microwave in June, 5 months later it has a lot of malfunctions. I took it in on Saturday the 7th of November and was promised that it would be with the supplier by monday and id get my feed back soonest. Monday, Tuesday passed then on Wednesday i called in and was told that Zanele is on leave and that she will call me the next day. Thursday i waited the whole day and no one called me. So i decided to call in , but again Zanele was not available and was told that she would call me back. i gave them my contacts and name.No one came back to me. Do you know what an inconvenience it is without a microwave in the house with kids? I bought one of the best microwaves hoping to get joy out of it but i was wrong. can someone please get back to me or else give me my refund ill go but it elsewhere. im very inconvenienced here!!!