Reverse money

I am so frustrated right now with capitec Bank, my mother Inlaw transferred money to a wrong number, we tried phoning capitec for assistant and all they can tell us is they are not able to reverse the money as they have no right to take the money from their client without permission and my question is what if by the time they reach the person he already used the money coz they are not able to take it unless they contact the person 1st and how came banks are able to reverse a debit order from companies but their unable to reverse the money that I have sent by mistake? Now my mother Inlaw show just give her last R500 to a total stranger. This is so frustrating!!!! Her contact details-*** and her ID- ***