Added extra data to account without authorization

Im trying to sort out my account that has been wrongly billed and for the last 3 months no one can or would like to assist. the only NR i can find for telkom is 081180 my case nr is ********** 9, No one can provide me with proof of my original contract or that anyone advised me regarding the extra add on data of R500 a month once my data has been depleted??? no where in the terms and conditions does it state that or on mail or over the telephone.... i did not ask or request for it even thou the guy explained it is standard with the contract (after 3 months) it was no where stated on any form of communication, it was not pointed out in the beginning of the contract or anywhere else but yet now i have to pay these extra add on???? this is unacceptable. No one can help in call center, cant transfer me to a supervisor, you only get an witty agent that doesn't know what he is doing or not interested in helping you sort out the problem, no managers or supervisors around for assistance he keeps telling me it was done online and that i must phone online yet he doesn't have an tel NR and said i must google but on telkom it only provides the same NR iv been phoning for the last 3 months.....????? this is ridiculous!!!! Can someone please assist!!!!! I need this account to be sorted, iv stopped my debit order so that someone will contact me but even that didn't help they only change the reference on bank and still put the debit order thru without my permission for the full amount due and my line is still blocked/suspended, how the hell do you work???? I will not tolerate this amount of pathetic services im receiving???? I cant see why i have to pay for something i did not request, my contract was suppose to a straight R149 a month with no add on's. No one call help assisting me with this matter, there must be some sort of paper trail or telephone recording - how else did you get hold of my details for the contract?