Unfortunately contracts are for a minimum length of time, not for a fixed length of time. If you read the contract you can see full details of how the contract can be terminated. I presume that you have a copy of your contract? It is surprising that NTL have not contacted you before regarding unpaid bills. Did you have your mail redirected when you moved out? The new tenants of the house you rented have probably been using the services that you are being asked to pay for so you could try asking them for the money.
to cableforum . by the way.