MONEY BACK/REVERSAL

i am a small business owner which recently started.

on the 21/05/18 the some of R12,075-00 was transferred from my business account by the teller at FNB wrongly to a STANDARD BANK account which was ment to pay a supplier. on the 22/05/18 i called the supplier for my stock,that's when i noticed there was a problem i then went back to FNB the next day to let the manager know about the matter , the manager then took the matter to their reversal team,their reversal team sent me the mail on the 02/06/18 telling me that its impossible for them to revers my money because i paid and cleared the payment but irrespective of the out comes on the reversal i still have to pay them R238,64 which they already deducted last month from my account,

i then went to standard bank spoke to the manager and show her the proof of payment where my money was wrongly paid into,she then called the client/account holder and ask permission to revers the money from his account,even today i am still waiting for money please help