Billing And Inaccurate Amounts

As I type this I'm on the line waiting for an agent from billing department to answer, waiting for 36:21. I received a message from them telling me that they failed to debit and I called them and spoke to Kabelo who told me that he sees that there is R95 outstanding and it's been transferred from my account to another account that he can't disclose due to Popi act. Now I am with the agent from billing department Val and she is telling me that they billed me incorrectly end of December there was a shortage of R95. But they suspended my account because of their error. I'm so angry. I'm loosing business because of the error they made on their side. I don't even know how much is my bill amount, sometimes I pay R739,R836,R789 and now because of their error I'll be paying R889.