electric oven diplomat aba3340?

I bought this oven in June 08 and it is faulty but i have just been told that my warranty is void due to the collapse of mfi and the extended warranty which i purchased is also void!
Lately when i switch my oven on my grill also comes on which means most of my food ends up burnt or not cooked properly. This cooker has a settings for grill, large grill, top heat (oven), bottom heat (oven) and top and bottom heat (oven) with fan. The only way I can cook without my grill coming on is through the bottom heat which means it takes ages to cook anything!! Does anyone no what is wrong with my oven??

lori smyth
February 2009