Horrible service from defy

Where do I even start. We bought a defy stove (gas plus electrical). 2 months into using the stove, the gas stove started giving us problems. We called defy, they sent a technician. A week later, we experienced problems again. Defy sent their technician again. Again, the stove gave us a problem, we asked defy to replace the stove, but they said no, and sent a technician for the 3rd time who reported that the stove was fine because at the time he visited, the stove was switching on and not making any noise. We tried to show him the videos of the stove, we took a video each time the stove gave us problems, but he refused to watch and said defy policy doesn’t allow them to watch customers videos. He left, we reported the problem again, and the same technician came...for the 4th time. Again, the stove was not fixed and defy decided to close the matter just like that. We feel that defy treated us unfairly. Now we live in fear of our lives because we have a dysfunctional gas stove. Should anything happen as a result of their gas stove, defy should be held responsible.