Bad after sales service from Makro/Defy SA

Hi Makro I purchased a Defy full gas stove online on the 26th of September. Delivery was prompt, but I had to wait a further 3 days for installation from your team of installers. It was discovered that the oven fan was not working. Process was followed, and a Defy service tech came and adjusted settings and the fan worked. Only then did I start using the oven part of the stove, and the oven flame kept going out. The tech team was sent in twice to solve this issue which couldn’t be resolved. The technician said I must log another request and must ask for a senior technician to come out. A reference number was given by Defy, but to date nobody has come to fix the stove. I have emailed Defy again, emailed Makro, called Makro, visited returns dept Makro, still no replies or resolution. I bought a new stove, that is not working. As per Makro’s return policy, the stove must be returned, no cost to me and I must be refunded. Why am I not been assisted???????? Am I going to be messed around until the 6 month return period has lapsed? What game is been played here? I want my money back!