Cannot Cancel Cell C Get It

I called Cell C in January to inform them that I did not want this Cell C service any more .It is now June and they have still not cancelled it, I called them again on Monday 01 June 2015 to follow up and they said they had not cancelled my account because before my account has to be cancelled one of their call centre agents has to call me to notify me that it is getting cancelled. This does not make sense because why would I need to notified that my get it subscription is been cancelled when I am the very person who called to get it cancelled. The agent on Monday promised me that someone would call me immediately, but Monday then Tuesday passed without a phone call. Only late on Wednesday did get a missed called from Cell C , now i work in industry and its absolutely not possible for me to always answer my phone at work for safety reasons.Its ridiculous that Cell C feels that they can make the process of cancelling unnecessarily difficult..This is a slap in the face as I have not once failed to pay my account yet they fail to complete a simple if I get charged for this service again I am going to reverse that debit order and will not pay my contract until they call me and confirm