What more needs to happen before my stove will be fixed?!

On the 8th of January I logged my first phone call to Defy regarding a fridge and a stove that needed to be fixed. The fridge nor the stove was fixed on the first call a week later. A part needed to be order for the stove. After two weeks of hearing nothing, I then phoned to hear what the hold up was. The technician then came a week later and then reinstalled a thermostat into my fridge, was incorrectly installed because then my fridge started freezing. Another technician was sent out and then pointed out the problem. My stove at this point was still not fixed, as the wrong part was ordered. The new technician looked at the stove and identified what needed to be ordered and said the previous technician who was sick at the time, will come install the part when he is back from sick leave. After another 2 weeks I had to phone Defy again. The gentleman came back, fitted the part and left, saying that it was still not fixed. WHen I tried to use my stove, there was a gas leak and I had my robe burnt. I then spoke to the second technician who phoned his manager to inform him of the wrong doing. On the MOnday (the 2nd of APril) I had a full blown explosion from the gas leak and upon phoning the manager I was informed that the gentleman was going to be spoken to and that the stove was going to be collected. It was collected on the 4th of April and I was told by the manager he was going to phone me to inform me about the progress of the stove. NOw the 12th of April I had to phone Defy again to ask what the status of my stove was. The manager said that he would phone me back, which he didn't do after 90 minutes. I had to phone him again and was irate by this stage because there is absolutely no promises delivered. The gentleman responded whether "Are you finished?" and told me that I should have trusted him to send back the stove this week. I could not have possibly trusted anyone at this stage as a result of the previous poor service. Defy does not have a complaints or customer service phone number online to refer to. I was then phoned by the initial technician and told that my stove is being returned to me but there is still a part that is needing to be ordered and it be fitted once the part has arrived. I have had enough.