incorrect billing

In July I upgraded my Telkom Mobile contract and consequently received an account with additional data packages charged. On the 4th of August i called the callcentre informing the agent that I have never requested for any bundles to be added. she then advised that she would log a case and that the turn around time for resolution would be 5 days. Its been 11 days and still no feedback. I have called the call centre numerous times with agents (Lufuno,kabelo,riyaad) giving me the same answers