poor quality kelvinator stove poor service

I've logged about 5 faults with my stove however o logged the latest one 3 weeks ago. According to the outsourced company the knob needed to be replaced n hifi Corp took two weeks to give the go ahead! Then the company gets the part but it's a wrong part. I'm quite annoyed and baffled by such sick n poor quality of the stove, the service and the quality. Thank goodness for the extended warranty. Just feel sock wondering what will happen after that