ewallet reversal from reciever

Today i went to Fnb Giyani branch on da 29 feb 2016 afternoon we all stood in line waiting cause no Atm had money so when we asked the fnb workers they said the guys who are supposed to load money arrived the on it so while others are deposting one could withdraw so i went to check if i could witldraw so i did wat is required to recieve ewallet n da transction went through but my money did not come out it was R1500 AND i called they said it will take 13 days im really confused why would i claim to not recieved the cash fnb should be able to reverse if a if the atm doesnt have money y transaction went through poor mobile banking .