Bloody insurance company has scammed me out of a years ncb.

When i started my policy last year with adrian flux i sent them a copy of my ncb wich was "3" years,now this years policy was due to run out on the 19/10/2011 so i found my insurance cheaper elsewhere so rang up adrian flux on the 17iirc to say id like my policy to run out and not be renewed ect and can they send me my ncd entitlment wich iv got now and it only says "3" years ncd on it so what have they done with my ncd for the last year?
What can i do? Can anybody help?

Cheers
Danny