Standardbank what a joke

Standardbank Private banker for prestige accouny holders is a joke, trying to reach my personal banker Tumi from secunda branch but they refuse to pick up the phone. Phoned standardbank and they said they can not assist me with changing my email address on my account, i will need to go into the branch for that, I work in Mongolia as an expat and are only returning to south africa in mid december, surely someone should be able to assist instead of me wasting 17USD on a phonecall just to be told off, ridiculous