Incompetence

While opening a new account, Nedbank decided to use an expired/old cellphone number for the new account, meanwhile that number was previously used years ago for another account. They decided not to confirm any contact numbers while opening the account, and now when asked to have the number changed, they informed that one has to go into a branch to do that. The banking app can't be used, because any confirmation will be sent to the old number. They refuse to rectify this telephonically.