incorrect transfer

So on monday evening i made a transfer using cellphone numbers to someone of the same account as me (capitec), i mistakenly entered the last 2 digits wrong and the money was sent to wrong account. I agree that i made a mistake but what ****es me off is the manager at Van der hoff branch in pretoria where i reported my fault told me that there is nothing they can do about it. My R1 100 that i deposited cant b refunded since the person i deposited money to had withdawn the money. I opened the case and provided them with case number but still they say they cant assist me.