Inconsistent service

I called into FNB last week Tuesday (25 July 2022) to make a simple request of changing the bank account where my home loan debit order is run from (from FNB account to Investec account). I requested this change to be effective on 31 August 2022. I called the bank again to confirm that debit order for the current cycle (31 July 2022) will run from the existing account - I got this confirmation. To my dismay, I awoke this morning to a notification that the debit order ran from my Investec account.

This is one of the reasons why I am in the process of moving my banking portfolio from FNB.