Late Billing

I have medical aid with Discovery and I won't lie, they are great! My previous medical aid was cancelled due to late billing. I then took out new medical aid with them and asked to be debited on the 27th of every month or latest 28th. The debit order did not go off on the 27th of this month. My medical aid is supposed to start on the 1st and so this will not affect me negatively.