DATA DATA DATA??????

We took the August deal of the month with Telkom on the 10th activated and set everything up on the Morning of the 14th we logged on to the internet and were informed that our data was depleted?????? Called the Call center to Query this and were told that in four days we used 7 GB Data 2 of those days was over the weekend and we not even home for the most part, requested a Usage report (at this stage the Wifi Router was off and Unplugged) saw on the Usage report that even after the Modem was Unplugged there was usage? Spoke to an agent who Bluntly said that they cannot provide anything else other than the Usage report and that they have no proof the modem was unplugged as there cannot be usage if the modem is Off.... so i ask you with Tears in my eyes.... How can i Use a vodacom wifi router with 3 Gb and it lasts me a Whole month Sometimes Longer and with Telkom we apparently use 7GB in 4 Days this is Pathetic and i wish i never signed a Contract with telkom they are the Biggest ***** i have come across so far......