Discovery failing to update personal information and banking app not working

I have been a discovery bank client for years but have struggled now for 4 weeks to update my email address. My transaction emails gets sent to the wrong email address and Discovery fails to update my records. Over the weekend I could also not access the app, as it indicated that I am not a banking client. I phoned again this morning, and had to wait for the person taking the call. After 30minutes the call dropped. I still can't access the app, nor the internet banking and my email address is wrong. It is truly frustrating as I can't access any of my banking, and in 4 weeks they have not managed to sort this out. I fail to understand how they want to run a bank if they can't even change a clients personal information.