Banking Fees - how can we help you - never

I've queried this before and keep on getting a stupid response which does not make sense. I've been banking with FNB for years now and have asked that banking fees be moved to the end of the month WHEN I GET PAID. But according to them this is not possible. Why can I not choose when my banking fees goes off my account? Why do I have to make provision for MIDDLE OF THE MONTH banking fees as well as end of the month banking fees?