FNB Personal Loans Double Debit after Settlement

Im so dissappointed with FNB. I called early in the morning on Tuesday the 26th to check if i can settle my Personal Loan account and if i wont be double debitted should i settle my account and the person i spoke to said no. I made the settlement and called again to check if my account is closed and the person i spoke to said no debit order will go through as it will reflect on FNB's side as zero amount to be paid.

This morning i have been debitted and when i call to rectify this I am told that debit orders are preset 5 days in advance and none of the consultants told me this when i called to check. Despite having paid i am told that i have to wait 5 days for my money to be reversed but i cannot wait that long as i have paid twice and am now compromising my other debit orders.

FNB please fix this as i did call in advance trying to avoid what has now happened. It is not my fault if your consultants at Personal Loans are ***********. R3900 is not small change i can just pass off not having for 5 day!