CHARGES STILL GOING OFF ON ACCOUNT

I have a cell c airtime subscription on my account which I have requested to be cancelled at the beginning of the month through your call centre and was told by the lady helping me that it has indeed been removed from my account. I received my statement on the 13th April and I called on the 5th of April to cancel the cell c airtime subscription. I demand this to be investigated immediately and I want this to be removed from my account asap!! As I never even had a cell c number and have never used any of this airtime, I actually want this to be refunded from the beginning as I never even remember taking out this subscription and I have tries countless times to cancel this but to no success and now I am sick and tired of wasting my time holding for your call centre to help me and every time nothing seems to be done as I requested. Please sort this out immediately!