Prepaid billing is a ****

I did not connect my DSTV for the month of October and November 2017 however I reconnected it at on the 16th of December 2017 and made a payment of R700 after being advised that the amount due was R690. So if my installment is R784 as the consultant advised me today why did i have to pay R690 in December when i only activated it in the middle of the month? R690 is 88% of the full installment but i only got a half a months viewing out of it?? I cannot see how this is legal? Infact this has made my mind up not to continue with your services as its not worth being ****** in broad daylight.

PS. Your call center staff could not assist with any of my questions and all had completely different explanations for the same question.

Thanks for Robbing me and Good bye.