I could understand it if I'd been with them less than 12 months or something. 
You're leaving, do you think they give a f@ck about you?

I'd tell them to stick the charge for not telling you at the point of cancellation about it.
well my BT officially SUCK
going to either terminate or change provider
does anyone know of a provider that does either short term or no minimum term contract?
http://www.plus.net/packages/half9/?utm_campaign=half9How can you argue with £3.24 a month
PS: If you do go with them, let me know and I'll give you a referral code