Telkom turned cell internet off despite BIS

I have been with Telkom, and I have had my Blackberry Z10, for a total of 10/11 months now. Every month my father (who is the contract holder, and who has been with them for MANY years) pays for both the phone and included BIS, but as soon as a small amount of \Recurring Telkom Mobile Data"runs out they completely turn my internet service off and say \""you are using out of bundle data.\"" Am I not supposed to be using the unlimited BIS then? This is unacceptable. I have no way of reaching people"