Poor Service

My name is Lebogang Karen Moatshe. I'm a capitec client. I comtacted the call centre yesterday evening after realising that I made an instant payment of 750 to Fnb an Incorrect Acc no . I asked the agent to assit to log a request for me however agent adviced no bank can do that? I wanted to find out if my bank and the recipient bank would not able to co-operate so that i am able to recover payment? Irrespective of my error , Generally that money does not belong to that person. I only need help in resolving this matter.