Unable To Assist As Usual - Settlement Letter Request

So once again I have issues with Standard Bank, all I want is a settlement letter for my credit card but because my email address has changed with one letter I need to go to the branch to fix it first. I managed to answer all the security questions and confirm all my details but that's not good enough. My son has been diagnosed with leukemia so with covid and him not having an immune system I try not go anywhere but because standard bank is so full of nonsense I have no choice...and don't come with nonsense about the new Popi Act because I can increase my credit limits and open new accounts online but wanting a settlement letter to close an account is too much to ask. Why don't they have a place on the app to update details. Can't wait to close this account.