Cancelling of Contract

My contract expires on the 22nd Jan 2016. I've sent CellC an email a few months ago online on their website for which I received no feedback. During the last few months several of CellC's employees have called me about an upgrade and I informed every one of them that I want to cancel my contract. Not even one of them told me that I have to go in to the branch or dial a certain number to cancel my contract. Now they tell me that it was not recorded on the system and that I must wait another 30 days (for which I have to pay!) for my contract to end!! This is ridiculous! Why didn't those people who called me inform me that they could not cancel my contract. I was under the impression that everything was in order.<br> <br> When they looked on the computer on my profile they also noted that I was paying an extra R20/month for an extra 100 MB data which I NEVER asked for!! The manager told me that it was impossible, I must have requested it. So he is making me a ****!! I would never have done that because I do not even use up my 200 MB data which is part of the contract!! <br> <br> I've been a client of CellC for about 9 years and I can't wait to go to another provider. I will NEVER recommend them!!