non-disclosure of product requirements

Good day I logged a service request last year in August with ticket number 540847. The ignitor for the oven has been replaced a few times. The feedback for the above ticket was that the warranty expired. I disputed this then Oupa Dibakoane rep**** with a very technical explanation and calculation - which I didnt understand. Basically it comes down to that my gas input is not sufficient. He informed me that I need at least a 48kg cylinder to keep the flames burning for this oven. My issue with this is since 2019 when the first ignitor was replaced the technician never told me about this and secondly how do you sell a product not telling the consumer what the minimum requirements will be to run your appliance. It's such a huge inconvenience that my wife bake or roast anything with an item that costs so much because she would need to ignite it ever 2 minutes with the hope it cooks through. For such big and international brand this is shocking and pushing the blame to the consumer is unacceptable. I need this to be escalated for a solution to this to be found ASAP!!!