Telkom over billing unknowing customers

I have a 20gig day 20 gig night contract witch was on special from Telkom including Huawei Modem. Is Telkom aware of the fact that they keep on billing their customers "out of bundle" rates ,when they're customers are not aware of this AND still the unknowing "not HiTech" customer get's billed after purchasing extra data. It would seem an exorbitant amount of unknown customers are being overbooked without even knowing it. It shows clearly a jump from one of my account invoices ... Table View Telkom customer services was surprised that these errors would happen Now wondering if Telkom would wake up? ...