Standard shoddy inefficient Telkom service, and ********** billing practices

I noticed recently that my Telkom invoice reflects mobile data usage charges (incurred right from the start, and running through a month) despite me having data available via a mobile data contract I continue to pay for. Each month I actually use a fraction of the allocated data I pay for, so I've accumulated a lot of date to use. On going into a Telkom store, I waited in a queue for approx. 20 minutes. Before engaging further with the representative that offered assistance, I clarified that they could assist me with a mobile data billing inquiry. The person I spoke to could not provide me with any more information than was already reflecting on the monthly invoice, insisting I was being charged for data above my allocated bundle, and would not deliver an opinion on whether the charges seemed erroneous or not. She was also "not sure" if someone in a Telkom store could actually peruse the billing information and give me an assessment, and refused to pursue any further action apart from logging a request for the billing department to contact me- which she insisted would happen within 15 minutes. It's been three days since.