Changing D/O details with Wesbank

I have been trying to change my bank details with Wesbank for nearly 3 months. They are draconian in their processes, still requiring you to manually sign a form. I am retired and do not have access to print or scan a document. They will not use my email authorizing them to change my account. Even though I have asked for a manger to phone me I keep getting the same requirements thrown at me. NO OTHER COMPANY gave me these problems