Repeated disappointing service from Vodacom

I took on a new Vodacom contract at Game Soweto on 11 November 2017. I was informed that the sim card fee was R97 and the connection fee was R97 (total: R202). . R105 was paid immediately and I was told that the balance of R97 would be combined with my monthly instalment of R199 (total: R296) and debited from my account on the 1st of December 2017. To my surprise, contrary to what I was advised, on 20 November 2017 Vodacom debited my account for an amount of R296. This debit order was not successful because it was not planned for. The unsuccessful debit order resulted in me incurring admin charges of R150.

As if incurring unwarranted admin charges was not enough, on 01 December 2017 Vodacom debited my bank account as per the agreed debit order date. This time R396 was debited. My agreed monthly instalment is R199 and the outstanding connection fee was R97, so what is the additional R100 for?

Please also advise if it is fair that I should be held liable for bank admin charges that are a consequence of Vodacom’s early debit order/lack of communication/ miscommunication from intermediaries of Vodacom.

I trust that I will receive a prompt response to y complaint.