Not on MTN? Be Grateful

I took an upgrade on my MTN Topup contract in August. Upon upgrading, it was confirmed that my new contract MTNCHOICE50 was also a TopUp contract which would give me R50 airtime, 100MB Data and 100 Free sms's for R169pm. When I received my August statement, it showed that my balance Due was over R500. I then phoned MTN to query this amount on 25 August 2015 and the agent informed me she would log a call for the billing department to investigate and get back to me. No one got back to me. <br> <br> My statement for the Month of September shows that there are Packet Switched Data Calls which amounted to R1926.67. I phoned MTN again and I was told that the system shows that all my limits are set to 0 and yet another call would be logged for the billing department to investigate what might have gone wrong. Needless to say my account has been debited with the balance due on the statement (which is incorrect) but I need to wait 10 days for someone from the billing department to get back to me. The agent who I spoke to (Jentilee) told me that although my limits were set correctly on the system it someohow failed on the network. <br> <br> My question is why am I being punished for MTN's incompetence?