contract cancellation

I called inn in November 2015 to cancel a contract that was coming to and end on the 30th of November, I even sent emails to cancel which was a mission I was taken pillar to post. Called in December still it wasn't cancelled , was told I should have called on the 30 th of November to stop the contract. Then I said then they should go ahead cancel because I don't want it anymore. To my suprise they are still debiting. Called this morning I'm told the cancellation department only starts at 8am and my contract is very much active. This I bad service they can't keep on taking my money like this. I want this to come to an end.