Faulty and Un-user friendly account update platforms.

I have tried every method possible (outside of the inconvenience of going to a mall in-store) to update my billing account details. My Telkom app faulty, keeps refreshing to login or showing error page, selfservice.telkom.co.za doesn't show an option to update details, only how you prefer to receive account invoices, even the page for the TBIS debit order form has an error page.