Funds Paid into Dormant Account

My sister deposited R1000 into a dormant account of mine. I have been told by a very disagreeable call centre consultant the money could not be paid back to my sister's Standard Bank account and that I would have to open another account with Wizzit with all the inconvenience of FICA etc and have it transferred to the new account - surely this would need more admin than just returning it to the account it came from. A similar thing happened to me with FNB and they just reversed the money back to the account that it had come from. Surely it cannot be right that another account has to be opened in order to get these funds back?