ABSA does not want to change my OTP number

I am currently in the UK and cannot receive OTP messages because I have a new number. I called ABSA that I wanted to change my OTP number, but they are suggesting that I have to travel and come change it in the branch. I mean, are we living in the stone age ? It is very frustrating cause now I am unable to order any groceries online or to buy anything. I can't believe that ABSA is leaving out to dry like this. I am planning to close the account when I go visit if they are unable to help me with matter .