As has been said we need more infomation to help (although I have a sneaking suspicion as to the problem - perhaps revolving around an initial conversation with a home energy consultant). However Npower most certainly do not offer one of the cheapest energy prices around, an article on this very site (http://www.moneysupermarket.com/c/news/new-eon-tariff-leaves-british-gas-in-third-place/0005843/) shows they're not even in the top 3 for the energy best deals available.