MTN CHANGING DEBIT DATES WITH LITTLE WARNING OR CONSENT FROM CLIENTS

I was informed by MTN 24 hours that they are changing my debit date to the 29 November 2024 because the agreed update for debits falls on a weekend. So they cannot wait one more day to get their money. I only get paid on the 30 on the Month. This would mean that i will be liable for the payment of an unhonoured debit. Calling also did not help; no true solution was offered. No desire to assist was also offered. Is this how you treat someone using your services for more than 25 years? Why do these big companies do this? What is the difference between waiting one more day when you have an agreed-upon debit date on your account?