Hidden fee from customers

Good day I have been a customer for Telkom for 2 years, I have been contacted by sell direct for an upgrade. What is irritating the most it's that I received the phone on the 30 October 2018, then I'm charge R90. 00 saying it's pro-rata, what I hate is that was boy informed about this because if I was informed could have asked to receive the phone in the month of November as it was already the end of the month. I have disputed this I asked for the recording of the day I made upgrade listened to it the is nothing talking about I will be pro-rated. I told Randal Muller the dispute officer but is not helping with the matter at all instead is not even returning my calls neither replying to my emails. I feel like the agent hidden the fee for his sales. This is so unfair not to disclose the whole information to the customer. If need any more information about the matter can call me ********** 274 or ********** 215.