A glorified paper weight

I recently upgraded my handset (thinking telkom has improved on their service, big joke right there!!!!) and received my monthly statement, and Telekom duely took their funds on the debit order date. Just to be surprised middle of the month with an sma stating services suspended and no reason why. I called the number provided and only got a human voice after the third attempt who said I exceeded my limit and when asked how is that possible if the upgrade was approved she couldn't answer me. I tried again to follow up on my query and this time I was told I short paid, to which I responded how is that possible when my payment is on debit order. I asked for a supervisor to call me back and was told it takes up to 72 hours to get a call back. How can a company operate like that. I'm hopeless at this point. I keep getting milked but receive no assistance when I try to get help.