Standard Bank - Charges interist on + Balance

Sold my house and closed the bond. Looking at the statement it was quite clear that standardbank charges interist on a POSTIVE blance <br> How can you do this<br> Only to call the call centre and no one can assist (story of my life)<br> This is how you treat a Pristige Client - Well I am now in a position to move my portfolio quick quick<br> <br> Is there any one that can resolve my 2 Issues