Failure to reverse R2000 sent to a closed FNB account

I have been a client of Standard Bank for over a decade now. On the 6th of June this year, l sent R2000 to my brother's FNB account via EFT. He later told me that he had closed down the account l had sent money to. I went to the branch to do a reversal on the funds. At first l was charged R320 recall fee and they came back and said that FNB advised them that the account doesnt exist. To me, they were stating the obvious because that was the reason in the first place l wanted to reverse the funds. Over the months upto now, no definitive answer has been provided and the funds havent been reversed. I have been emailing the complaints department since June