deposit wrongly tranffered to an old acc

I called their customer service trying to correct my banking details,a consent form was emailed to me to fill it in with new details and email back to Nowa,i did that on the 22 Aug,no confirmation was given I then took the time to visit their offices on the 29 Aug a coloured lady at customers service confirmed that the system still has my old acc and said the refund takes 4 to 6 weeks after one has moved out and since I moved out on 15 Aug my money will be tranfered mid-Sep ,advised that I call them again to request the form to resned new banking details to Nowa,i did that on 02 Sep I spoke to Reneilwe explained the whole situation,she said if its a new acc I have to take the form to the current bank for the stamp,form filled ,taken to bank for stamp and next day when im about to email it back to Nowa this was the 3rd ,I receive an email from them confirming my refund and this was done to the old acc,i called them Itumeleng assisted very nicely trying to help that the old bank give the money back to them unfortunately it was denied but im not satisfied as I still want my refund,I strongly believe I was not at fault, they need to make a plan....can you please assit with this matter