Send Nedbank's imali to the wrong number

After I logged on to Nedbank's internet banking I then made a transaction "imali". Immediately I received an SMS saying that the amount had left my account but the person that should've received it was still waiting. So I went back online and realized that I made a mistake with the last number. I called Nedbank obviously for help and all I got was "sorry mam but there is nothing we can do". I tried finding out if that message could not be replicated to a different number, or maybe see if the money had been withdrawn anything and nothing came out of the conversation. Just a waste of my time. How does "imali" not have error proof? Making mistakes should've been one of the major issues to focus on and still nothing can be done, even after so many complains yet nothing can be done, they're definitely listening to provide better service.