Their incompetence costing me money

FNB deducts their monthly fees in the middle of the month while my salary gets paid at month end. I've requested them a few times now to move the fees to match my salary date but it just gets ignored. This causes my account to run into arrears and then they charge me R220 for a failed transaction where their fee is only R186. Then the next day its another R220 for the same failed attempt. So at month end, their fee is costing me way more than 3 times of their actual fee.