Unauthorised Debit and Poor Administration

I have an arrangement with FNB on my Smart Spend Loan which has been confirmed telephonically and in writing via email on many occasions.

FNB is not keeping to the arrangement and has taken R-574.61 today without authorisation siting the reason for the debit as follows (SMS): "MR PRETORIUS, we have deducted R574.61 due to arrears on your FNB Loan. Contact us...."

In addition to the above, my outstanding loan balance should reflect an outstanding amount of -R883.89 (FNB can correct me on this amount if I'm wrong). Yet, on my online banking profile, it reflects an outstanding amount of -R2,836.69, meaning that they still haven't updated the payment arrangement on my banking profile even though I've asked them to on many occasions.

I need FNB to refund the unauthorised debit amount and to amend my online banking profile accordingly.

PS: This is not a repeat of a previous complaint, this is a new complaint based on a recurring error on FNB's part and as such, I do not believe that this complaint should be treated as a duplicate and removed. Please see my previous complaints of 20.08.2019 and 05.10.2019 to confirm that this is not a duplicate complaint but a recurring failure on FNB's side.