Netbank Incorrect Debit Order

I have a complain with Netbank. I settled their MFC account on the 13of August 2018 and requested for a settlement letter which was sent through to me on the 14th of August.

But to my surprise to they debited on my account today the 29th of August 2018. I tried calling them and requested that they refund my money but Anton the team leader at MFC Pretoria told me that i should go to the branch or wait 7 working days for my refund.

I find this unacceptable since this is their mistake but I am the one who has to pay for it.

I even explained that the nearest Branch is far from where I am and I am at work therefore it will be difficult for me to do that can't I at least make a call for that money to be reversed or any alternative but he told me that were my only options.

I would like an assistance since this is not my problem but I am expected to suffer or either spend my time and petrol (Money) to get my money back.

PLEASE ASSIST