Ignorance from Standard Bank

I have been with Standard Bank for close to 2 decades now. My problem is that I have requested them about 10 years ago to change my email address on their system but I only realized today that it hasn't been changed yet for almost a decade. And I requested more than 4 times if my memory serves me well. I was very disappointed today when Annita(one of their consultants) told me that my email address is ***. I even forgot that I had the email like this. My issue is that Standard Bank is a financial institution and my finances are my confidential information. And if standard Bank cannot take customers seriously then we have a crisis. I entrusted my finances which is my life with Standard Bank. But if they fail to change a mere email address as per our conversation then we are in danger. My family is dependent on me and I'm dependent on standard Bank. So standard Bank is posing danger to me and my family by being very ******** and for years. I wrote and also had telephonic conversations with them to amend my email address as nokovma****mail.com but they failed me a lot and it is very disappointing. May you please help me with this. Maybe the bank will attend to the request if it comes from you before we go to bank Ombudsman and then the lawyer route. This is very frustrating.