Vodacom Unprofessional Service

I have not even completed a week on my Vodacom contract and I am already extremely upset. I told Nomsa from Vodacom( she was assisting me with the application) that I prefer my debit order date to be the 20th of every month as I get paid on the 20th. I then called *** on Wednesday the 17/07/2019 @ 17:09 pm and asked the lady assisting me when would the first debit order go out and how much would it be, she advised that the debit order will go out on the 1st of Aug 2019 and it will be R458 + R105 = R563 and she also advised that I could change the date with Customer care.

Now, Imagine my surprise today on the 19th when I wake up to find that My bank account was debited and now I owe the bank R200 in charges as there was no funds in the account. The SMS I received from Vodacom also states that my balance is R120.75 and will be deducted on the 1/08/2019 so I do not understand why I have 2 Debit orders of R230 going off on the 19th!!! I need to know who gave Vodacom authority to debit my account on the 19th when I said the 20th and furthermore, what are they going to do about the charges of R200 that they have caused for me.

This is truly unprofessional of Vodacom and unfair treatment to me as their customer- I want that R200 in my account as I refuse to pay the charges when I was specific with my debit order date. I