Help closing accounts

I'm an overseas client. I've previously dealt with Thabo Madalane however emails to Thabo are now bounced back undelivered. Having to deal with Nedbank from overseas has become unmanageable. I will be returning to SA shortly, although just passing through as the main purpose is onward travel to Namibia. I need someone to tell me what I need to do to close my accounts while I'm in the country.