CLI Presentation Billed

Telkom mobile invoiced billed me for CLI Presentation from 10 December 2017 on a Wi-Fi router. I contacted Telkom and a consultant Zanele Langa would not explain to me why it was only effected on the 3rd month of my contract. Not even the entire month but from the 10th December 2017. She refused to log a case to pass a credit note for the prorated CLIP in December 2017 and the January 2018 one. She indicated it was not Telkom policy. She insisted that I approach a Telkom shop for an explanation yet the contract was initiated over the phone.

I need the prorated CLIP, i.e. 10 Dec 2017 - 31 Dec 2017 and the 01 Jan 2018 - 31 Jan 2017 removed from my invoice.