Telkom inconsistent service

Been having problems with my wifi router which would indicate that my data is depleted yet I could see that it was not. Decided to wait until the first of the next month and try it again. Router worked fine for approximately 15 minutes and again indicated that I was out of data. Went to the Telkom store in Maponya Mall and received PATHETIC service. The lady who helped insisted that it was possible for 12gigs of data to be used up in 15 minutes, no one bothered to check if there was a technical problem or anything of that sort. She then proceeded to tell me that one of the technical guys would explain to me how the data could be depleted after only using the router on the WhatsApp application for 15 minutes. Mind you, at this point none of the applications on my phone had updated and therefore that could not have been the problem. I proceeded to call Telkom and received the same lame explanation. The service in Southgate Mall however was better, as the lady logged a call with the technical team so they could look into it and also gave me a refund for the month of December. Telkom needs to sort out their poor service as it is seriously lacking as of late!!!!