FNB Not reversing airtime purchases

I have been using FNB since 2010 as a student till today as premier and only today i realised how their agents are creepy. I called them asking to reverse my airtime that I sent to a wrong number that is not in use, they said I should keep trying to call the receiver to send me back the airtime. I wanted them to reverse the simple transaction. If this does not go well I am shifting to capitec. ********** is my email