appallingly dangerous

I bought a cata static oven on offer at B&Q and it looked very robust. After a few months though I had problems with regulating the temperature, it overheats and you need to watch your food all the time. The whole oven heats up on the outside so much you cannot even touch the handle or control knobs with your bare hands. I have had an engineer out but now they need more temperature tests and trying to get someone to commit or call you back with a definitive answer is not possible. I am trying to get an address to take this further but again have been unble to get one so continue to phone.