Forced to pay for data I never requested

In Nov. I renewed my cellphone contract with Telkom Mobile.<br> The agent who renewed my contract informed me, and confirmed more than once, that my new monthly fee would be R245, all inclusive. On 03/12/2015 my invoice reflected a total R810.87. Besides some other fees, the invoice contained a recurring monthly amount of R349, as well as R162.87 for Add On Internet Bundles.<br> On 04/12 I contacted the call center to query this. I was given a case number and advised that I would be contacted within 72 hours.<br> By 09/12 no one had got back to me so I called again. Feedback was that the matter still hadn't been resolved, but a note would be made that I followed up.<br> By 14/12, still nothing so I again made contact. The agent informed me that the data allocation referred to had been cancelled, but I will still have to pay for the amount already invoiced.<br> Why must I pay for something I haven't requested or even knew about? I contacted Telkom without delay when I noticed the item on my invoice and never used the data that was allocated. I would like to have the amount charged for reversed and going forward all I want to see on my invoice, unless I purchase additional bundles, is the amount of R245