HELP

Okay so I made a mistake with one digit by paying money into a fnb account on 3 occasions I realized today that they account number was wrong by one number an called capitec to inform them that the account number of the fnb account was wrong an is there anything they can do they immediately told me no I then went to fnb an they helped me an checked the account that I have paid the money into an informed me that the funds that was mistakenly paid was still there since last month they then sent me to capitec for them to do a recall an now capitec is tell me that they can't do a re call I must sue the person civilly this isn't right so my money just lost yes I made a mistake by one digit but like fnb said it's a mistake an seems to them that the person did not use the money course they no it isn't there's an probably waiting for someone to contact them could someone help me course capitec isn't helpful at all