actually you CAN cancil your service without penalty as VM have just this month increased there charges meaning paragraph F1 aand J3 of VM's TOS come into play (which state that you can cancil your services without penality IF they increase your charge (with NO minimum increase for this charge to come into affect)) please read this post
http://www.cableforum.co.uk/board/34765747-post4.html for a detailed explination.....
though bee prepared for a fight with TS v0id's solution is however much easyer to push through