FNB still *****ing money, and applying double standards regarding debit orders

FNB keeps reversing my debit orders, slapping excessive penalty fees of R100 to R110 on my account for reversals, and gives 0 time to fix the balance when it goes over the limit. Yet when the debit order is for service fees, and it goes over the limit fnb THEN gives 3 days to fix the balance, keeps harrasing that the balance is over the limit, and gives 3 days to fix the balance or they will dishonor the debit order.

Which they do immediately for every other debit order that goes off from my account.

They have proven over and over again that they cannot be trusted with any debit order, and I will be taking steps to move them to another bank that can be trusted to execute them without cancelling it