Faluire to cancel a contract upgrade

I have asked MTN to cancel my contract upgrade and they have failed to do so giving me the turn around.<br> <br> Can you please cancel my contract ***.<br> <br> I did not take the Samsung S6 upgraded phone as I asked for my contract to be canceled. I am still using my old Samsung S4.<br> <br> You are still billing me for a sim card that is not in use and for a phone(Samsung S6) which I do not have.Told your delivery guys to take it back as i do not want it anymore.So you tell me how can you be billing someone who does not have your phone? I have it on camera footage that i do not have the phone.<br> <br> Today you send me an invoice of R2578.59 when you blatantly ignored my requests to cancel the contract upgrade with this stupid network provider MTN.<br> <br> I am not going to pay that amount but will pay the R550.51 of my old contract with a S4 on a (MTN Topup200 contract). but first i want this upgrade to be cancelled period!!!<br> <br> PLEASE JUST CANCEL THE CONTRACT NOW AND PUT ME ON PREPAID!!!<br> <br> All my previous reference numbers below and ignored.<br> #***3 - 5 June 2015<br> #***0 - 19 June 2015<br> #***1 - 14 July 2015<br> #*** - 2015-07-14<br> <br> Kind Regards<br> Wanda Mzamo