Can't change an email address after numerous calls

This is the 3rd time I've lodged a complaint on Hello Peter about the same Standard Bank problem. First time they responded, second time ignored me, now this is the 3rd time. Pretty shocking. I have asked them on numerous times to change my email address, they say they have changed it, but when I look again it is still my work address. I explained that we are not allowed to receive personal emails via our work email account, but they obviously don't care about that. The last person who phoned promised that she would phone me back to make sure the email hadn't jumped back to the old email address, and of course, she didn't call me back, no surprised. So after almost a year, my email address is still incorrect on their system. First National Bank are looking really good to me. If this isn't sorted out asap I'm going viral re Standard Bank. This is a complete waste of my time.