MFC DOES UNAUTHAURISED DEBITS YET AGAIN

I had a courtesy call from MFC just this week thanking me for keeping my acc up to date etc, on the call we confirmed my next debit will be 28th feb last day of the month yet they debit my account yesterday on the 24th...LIKE MAKE IT MAKE SENSE AND WHERE DID YOU GET THE RIGHT TO DO SO AS MY SALARY HAS NOT BEEN PAID AS YET!!!!!!!!!!!