bad service in cancelling contract

I called in in November to cancel my contract they told me to call back in December as the contract on end 14 January 2016. I did so and when we called in for the second time they told us it was only necessary to call in January 2016. we then told them to make a note on the system that we want to cancel the contract. we called in again yesterday to cancel and they said its fine but they going to debit me 2 extra months as we should have called in December to cancel. so I have called in 3 times to cancel the contract and every time we have they have told us something different. I feel they have shunted us around and now I have to pay the consequences of their actions because no one knows how to do their job. I want the contract cancelled and I will not pay the extra 2 months. they can go pull all the previous recordings and will hear that I have called in previously to cancel. I will be stopping the debit order on my account and they will not be able to steel my money any further<br> .