Deducted again

Unfair charge on account I was charged an amount of R200,00 on 27 April for an amount I don’t know why they deducted early ! It seems it’s the FNB monthly account charges. I had advised all my creditors in December already about my new salary date and for all debits to be done on the first , may the bank please refund me my money of a high exorbitant charge unfairly because I had notified of the salary date change now I’m the one whose being prejudiced again this month!