FNB - No due diligence at all

I recently consolidated a load through FNB, and as one would expect, the loan was paid off? you would this so at least, except today a debit order went off for that loan because why? FNB never closed the account with the original lender (Nedbank). I now have to go through a whole process of waiting for Nedbank to close the account and then decide if they will refund anything because FNB's personal loan department didnt bother to do their due diligence and close off the original account that was consolidated? and when i try phone FNB to get the debit order reversed Im told that it needs to "clear" first before they can even look at it which takes 24 hours (allegedly, past experience has proven this takes much longer). In the mean time, im sitting having paid a debit order for a loan that ive already technically paid off with no access to the funds and literally no help at all from my bank. for a problem they caused. BITTERLY UPSET AND WOULD NOT RECCOMMEND FNB TO ANYONE