Accounts department SHOCKING SERVICE

HAVE BEEN TRYING SINCE THE 10/7/20 TO CHANGE THE BANK DETAILS FOR MY MTN DEBIT ORDER! TO NO AVAIL! IT STILL WAS DEDUCTED OFF NY FNB ACCOUNT AND NOT MY CAPITEC!!!!! BUT IT WAS RETURNED THIS MONTH…..THINK ILL SEE HOW MANY MONTHS IT WILL BE RETURNED BEFORE THEY CALL TO FIND OUT ‘What’s going on’??????????