Disgusted with Telkom service

I'm disgusted to say the least after switching to telkom from my previous internet provider I was firstly never given the option to start at the beginning of a month and therefore thought that the balance of that installation month would be free of charge, however I was charged more than my monthly contract amount for what they claim is pro-rata.

I've sent call me back requests to telkom, because when I do phone I wait forever online and wasn't paid any attention. Much rather a consultant phoned me for another sales pitch and was also asked to request a call back on my behalf as her explanation of the pro-rata amount wasn't clearly understood and am also still waiting for this call back.

I really don't have any issues with my internet connection or anything, but I do not think that I should be charged more than my contract amount for a pro-rata amount, which in it's definition is supposed to be calculated as a portion of my monthly contract.