bad service

i just called fnb because i wanted to reverse a payment i made less than 30 minutes ago. they telling me its not possible. how so? i just made the payment now & instead they're busy sending me forms to reverse the amount. i spoke to a team leader rene or something who told nme it takes 12 hours from fnb to fnb. this paymnet i just made now less than an hour ago. at fnb a person can not make mistakes? we're supposed to be perfect? this world is not perfect & am sure thy too are not perfect. am just annoyed at the service am getting at this bank.