Telkom and Nedbank debut order ****

Telkom has been deducting unauthorized debit orders every month, above the agreed monthly contract amount. Each time I call Nedbank to reverse the unauthorized debit order by Telkom, R35 fee is levied on my account for reversal of such transactiion.

Last week on the 20th February 2019, Telkom took R647 unauthorized and that is 7 days earlier than my pay date. I called Nedbank to reverse the unknown transaction and the R35 was levied. Seven days later on the 28th February, Telkom unauthorized took R484 from my bank account on top of the monthly agreed R470. Again Nedbank reversed and charged me R35.

Who gives Telkom authority to abuse the relationship with my account at Nedank?

What is the cost structure of Nedbank to reverse unauthorized transaction?

I theorise that Telkom and Netbank are making multi millions from reverse of transaction fees. if we assume that 1000 000 clients affected that is R35 million split equally.