Furious Customer

Last night I mistakenly sent money to a wrong number using the imali feature. Being on a professional level banking platform I called the contact center number which they took over 15 minutes to assist me. Then to be told that they can see the transaction and I have to wait 48 hours to wait and see if the person withdraws the money! Is that the level of service nedbank has to offer? I'm sure I'm not the first person to have made this trivial error! How can a simple transaction like this not be reversed or stopped and a paying customer of Nedbank not be assisted?