No help from capetic and standard bank

I went to them on 12th September after I send the amount of 1000 to the wrong account to standard of which I wanted to reverse but they said because I made an immediate payment the won't be able to help as that they won't even try to contact the customer so to inform her/him that the has been an amount that went to his account by mistake, even standard bank could not help as I did go to them to contact their customer and inform him to return my money they said the I not able to give me the customer contact of which I understand and the reason I went to them to contact the customer but the said it is my lose I won't get my money back please assist so they can take this matter seriously I need my money