Bad customer service

I bought a Defy stove on the 25th of July. I have struggled with baking with the stove cause whatever I've baked just never got to be done well. I've let the store know(OK Furniture Siyabuswa) and they have told me that Defy will need to send out their technician. Your technician came to my home only to tell me that perhaps I need another baker to come and show me how to bake, and he even asked me if I am even able to switch the stove on""". Defy if you're going to send out your personnel to people's homes at least send someone that is more customer orientated. With this, I am just letting that technician that the stove is baking well on option GRILL at 160temp. I've been baking for so many years and I've definately took offense by what he has said about my baking skills and I am still convienced that the oven door is not completely closing.