Request for Clarification on Debit Order Date Change

I recently received an SMS notification stating that my debit order date had been changed to the 20th of the month, supposedly in line with my payday. I ignored the message because I did not make any changes to my profile.

On the 20th, a debit order was processed against my account and subsequently bounced. I would like to know who initiated and authorised this change, as my salary is paid at the end of the month. This adjustment is incorrect and has resulted in unnecessary costs, as I am now liable for fees of R230 due to the bounced debit order.

Please urgently clarify who authorised the change to my debit order date and provide supporting details.