Charging your bill with extra data without asking

I have 2 contracts. I phone so that a consultant can load extra data on my ONE contract. She then made a mistake and loaded on both the contracts. After admitting she made a mistake she said it cannot be reversed and she will pay it out of her salary. That never happended. When i phoned to query, one of the team leaders took over the case and confirmed that it was Their mistake and I will be refunded. Which also never happened. 3 months later Siale Tshabalala calls me and said it is my own mistake I asked for data and I then used it and they will not refund me. I had data on my phone and the phone doesnt tell you when you are using the extra data. So how was I supposed to know or should i have not used my phone untill telkom decides they will correct the mistake. The call centre is pathetic and consultants are *********** to assist you. Each consultant tells you something different. I AM FED UP AND DONT WANT TO PAY FOR SUCH POOR SERVICE.