Incorrect parts - and no feedback with solution

My Defy stove's knob's numbers came off with time. I contacted Defy and was told to contact a distributor. I took the serial number with that was underneath the knob as I was told to do. I got four knobs. When I tried to fit them the fitting was the wrong way round. The off "0"was on the side between 3 and 4. I went back to the distributor - they checked their stock and said they are all the wrong way round. Went to another distributor in the area and when I gave them the number they immediately told me that that specific one is the wrong way round. So they've had other customers with the same problem. No one from defy is responding to me. What must I do - buy a new stove just so that I can get knobs with numbers on them? Service is very poor - or should I say non-existent..