Unable to maintain Customer Details

I left South Africa to work abroad on a temporary basis. On leaving I updated all my details to ensure that I could access my bank in South Africa. Once I arrived here I was unable to log in. after numerous emails, calls, terrible service, and 6 weeks the issue was resolved and my email address was updated on the system. As Standard bank does not keep one master database of customer information, but rather shattered information that is not synchronized my email address is once again not correct. My e-bill is sent to the email address, any emails I get from them is to that email address but I cannot log on. I sent a few emails to the customer care department, the first couple were responded to with thoughtless statements and no resolve, and my later emails have just not been responded to. I have been waiting now for a few weeks with no response. As a bank that would like to be taken seriously the architecture of its data should be a priority, as this leads to concern that other details of mine and other customers may not be safe. I feel insecure trusting the bank as it has proven on to many occasions that it is unable to be responsible with my private information.