Failed to Cancel, charged me for it and still won't refund!

<p>i have now contacted Telkom endlessly, I upgraded my 20gb LTE to Uncapped LTE and cancelled the 20gb on the 17th of January 2017.m(so they said it was done and the sim is no more of use). Then I get debited for both accounts plus pro-rata at the end of Feb cause they didn't cancel it..I logged more calls and they said it's been cancelled now in March but they still send me a invoice for my account to be debited for both contracts...they solved the case number saying payment was waived and canceled..but they still going to charge me this month plus havnt refunded last month...I phone in this morning wasting my airtime where they woman Caroline said she will open another case and send it to me..which also didn't happen because a new case was not opened...they have all the recordings of the cancellation and the disputes thereafter!! Refund my account!! I can't afford to be charged for your mistakes!!</p>