What must I do to get an E-mail address changed!

When I stopped using my work e-mail for private e-mails, all I had to do was phone all my creditors and they changed it online. But NOT Standard Bank, I was told to go into the bank. So I went in, waited almost 45 minutes to be helped, only to be told the certified copy of my marriage certificate wasnt good enough, she wants the original. I drove home, got the original, went back, and she said she changed it on the system. Imagine my surprise after all that, receiving my statement on my work e-mail the next month again!! So I try again, go into the bank, wait at the same place I was helped last time, I couldnt understand why I was ignored for 30minutes, even though the two ladies saw me. Then after another 15minutes she asked me if I signed in, should I have done that?? Then Im told Im at the wrong place, go to enquiries, waited another 15minutes, she said it was changed. But today I get my statement on my work E-mail again!! I give up, my time is being wasted in the worst way. Standard Bank has no Customer Service.