Poor digital service

I bank with FNB, they recently alerted me via the app that I need to update my personal details via a tab in the app. I have been attempting to update my details via the app for a month now but it keeps giving me an error with a number to call. When you call that number they can't help you, you must be transferred to another department known as KYC where they don't answer the phone. They recently won the BEST DIGITAL Bank award but they can't even get their app to work efficiently