E wallet reversal

I sent an ewallet to the incorrect number last night, I called the fnd call center immediately, I dialled the number they advised to call - ********** as well as fnb ***** on ********** to stop the transaction, no one answered to assist, this morning the money was withdrawn, and fnb only opens at 8, they now advise that it's too late to stop the transaction. if only the were available and answered their phone when I called, I would not have lost R1500.00. Agreed this was my silly error for inputting the wrong number, but there is no recourse in rectifying my error. thanks fnb, so much for "HOW CAN WE HELP YOU"