Getting charged for a contract cancelled

Phoned autopage at least 9 times for a contract that was cancelled on the 28 February 2015 that they are still charging me for. They say they can see it's been cancelled but they still put the debit order through my account. How these people are still in buisness is beyond me as everyone I have spoken to has told me the service is pathetic. I have phoned and e mailed them about this complaint and no one can help me. What they are actually doing is considered *****ing. I am at my wits end.