Cheating by PC world on warrenty

Currys PC world is mis selling warranties on electronic items. Inspite of me telling them 15 times that I am just buyng TV and Blu- Ray and do not need anything like warranties. They took my signature on direct debit form by hiding it behind other form saying its delivery signature.
It seems small thing but it's about people and honesty. And saving others from being cheated by them.

Any company should not be allowed to sell insurance or extended warranty along with product. If required they can just suggest. But should not be allowed to signup customers while selling product.

I can't believe how much they can do just for achieving their sale target. I am not able to sleep and sit with children's to do their school homework. I googled and there are BBC NEWS also on such thing. I am not alone.
Someone has got getup and stand against it and save others.