Complete Incompetence in their credit card division

My debit order is set to the 15th. EVERY single time the 15th falls on a Sunday or Public holiday, for some reason WFS is unable to run the debit order so they send me "failed to pay" notifications and charge late fees to my statement for their incompetence in being unable to run the debit order before or after. I NEVER have this issue with any other debit order, have reached out to them EVERY single time this happens and here we are again. Pathetic!