Exorbitant charges

I have been banking with Nedbank since 2007 and have on numerous occassions asked them to please honour my debit orders before taking their banking fees and they continue to ignore me. I also have a feature where they would send you a message to say deposit money into your account as you do not have suffiecient funds. Recently this happened again my pension debit order was declined because Nedbank once again decided it is more important to take their fees first and not to honour my debit order. They then proceed to charge me another R150 on top of that for an dishounered debit order making more money off me. I cannot afford to let my pension lapse as that is all I have when i retire. Nedbank are truly a bunch of ******.