My email address on another client's FNB account

I have been receiving email notifications for an FNB Easy Account transactions meant for another person. I raised this issue with FNB private banking and service desk and they keep telling me there is nothing they can do because they cannot update another client's account without the client's permission, however that client has my email address on their profile. This is inconveniencing me because I keep getting their transaction notifications. Can someone please get FNB to please remove my email address from this person's account or get this person to have the email address removed.