Reversal of funds

Money was transferred from an FNB account to a Standard Bank account using the incorrect banking details. The funds did not go into any account as the account number was missing a digit. It was queried with Standard bank and I was assured that the funds will be returned to FNB. I consulted with FNB and was told that the funds would be returned to the account that it was sent from within 7 days of 8t being returned. It was returned after 3 days to an FNB bucket account. I was then told to submit a reversal request to get the funds back at a cost of R326. I did this. I did not receive any feedback. I had to email them for an update. I was given the response that the transaction was unable to be processed due to the account number being wrong for the payment of the R326. I have checked all the details. The account number is correct but the branch code was incorrect. I am sure that this should not matter as FNB usually uses a universal branch code as long as the account number is correct. I will now have to start the process all over again. And I would not have known this had I not emailed them to find out. My question is, should this money not have been returned to the sender without a recall and reversal completion as it was never deposited into another account and it was returned to the senders bank within 3 to 5 days. Should this money not automatically go back to the sender like I was told it would.