fnb

I put money into the wrong persons account, I called and went to the bank to get assistance, I asked the people who work for fnb to contact the person that i put money into, I gave them the bank details, apparently they cant call the customer the amount is R520, that is a lot for me. They want me to fill a form which will cost me R313 , It doe not make sense, how difficult can it be to call the customer to say money was incorrectly put into you account, please contact this person.