Can't cancel my Account/Sevice

I phoned on the 17th November 2015 to cancel my service with them. I was informed that it could not immediately be done but will be cancelled on the next payment date 28th November 2015. I noticed on the 28 December 2015 that my Debt order went off again. I phoned them on the 29th December to queiry why. They told me their system could not switch off prior to the 28th November and that it is now my RESPONSIBILTY to call them on the 28th November to reminded them to switch off the Service. <br> On the 29th December when i called i was told that they would have to request and listen to the Call from the 17th November 2015 and would advise me after 24 to 48 hours. <br> I called again on the 12 January 2016 as i have not heard from them and again i am told they will have to request the call and then only they can advise me. My account according to there system is still Active. This after they where instructed on the 17th November and again on the 29th December to cancel the service.<br> Unacceptable work ethics, i am forced to pay for a service i am not using.