Bad Service when trying to cancel

I have called in 3 times since November, to cancel a contract that has already expired. Consultants have confirmed the contract is cancelled, but I still see this on my bill as an active contract. Consultants are only interested in trying to convince me to upgrade, when I have made it VERY clear I don't wan to upgrade, I want to cancel. I am now paying for a contract I am not using, and getting nowhere trying to cancel.