Telkom Mobile double debited my account

Telkom Mobile double debited my account, R1200 on 25 August 2017, another R1294,58 on the 26 August. Seeing the second debit order, I went to the bank and reversed the R1200 3 days later.

This morning, I noticed my Telkom account payment for August hadn't been deducted so I logged into my Telkom Mobile profile, downloaded my statement for this month and noticed that I need to pay R2873.52 at the end of September, and a note saying R1200 was not authorized, which is fine. Now what I would like to know is, where did the R1294,58 go?? I did make payment for August which was R1469. Can I get answers? Where is the 1294,58 that was debited from my account? I call into the call centre and no one picks up the phone, I swear its a nice jol at the call centre. I need answers.