Account name changed by error from bank side after 5years

I've been married for 5years and changing my surname was the first thing I did. Receive my statements monthly via email and statements received on 04/01/2021 was in my married surname. Yesterday when I downloaded my statements I noticed my account name was changed to previous surname. Even my account details on banking app was changed. This morning I phoned the call centre and was told I need to go to my nearest branch for my profile to be amended. The problem I have: 1) I don't live 5minutes from my nearest branch 2) I am not going to sit outside the branch in a queue with our daughter and wait 1hour/longer to be helped 3) Not 1 person at call centre was able to tell me why my surname was changed 4) If it was a system glitch, what else can be affected? I didn't amend anything on my account details. This is pathetic - don't know why I still have my accounts with SBSA.