Can't update my account details

I've had an account for many years. I now live in the UK and wanted to use the account to do an international transfer. I discovered that address details had been incorrectly maintained on my account which prevented the payment from being made. I have spoken to many people on numerous help numbers. I have tried to contact my branch through numerous numbers I have been given but never get through. I am told to visit a branch to get details updated, in spite of me saying that I do not live in South Africa and therefore can't. It is very disappointing that there is no mechanism to get my details updated when I can't visit a branch. What would a disabled person do in South Africa if they had a similar problem and couldn't visit a branch?