Online banking reversed to a ***** guy

I feel disappointed and helpless but to cry the whole day.i deposit money to a person to build a house for me but that's person dissapered for a month, I decided to go to bank to report him than FNB block his account until that person visited bank asking about his account, than bank talled him the story, than he agreed to pay back my money, we meet at the bank and deposit money using online banking. And the bank talled me to wait for 24 hours, I did so, but after a day my money not in, I rushed to bank again and ask the problem, the bank reversed the money to that ***** guy again .what can I do please tell me, because that's guy account is empty cause he even withdraw that money was supposed to mine.i am confused and don't know who can I blame bank or that guy.