Poor service

For the past few months my monthly credit card debit order would come off on the 9th of each month. At least 2-3 days before, I would get a reminder email so I could ensure there was sufficient funds. This month (April) the debit order comes off on the 7th (why not the 9th like usual?) and I get the reminder email on the 13th April - 6 days after the debit order came through and was returned unpaid! (I have all the screenshots should you want to see them). I then receive a warning SMS notifying me that I need to pay the balance by 18th April to ensure continued use of the card, so I pay today (16th) but when I try to use the card it has already been blocked. Will I still be charged a fee for the returned debit order in spite of this poor service? Standard Bank - your service is usually tops - I hope these glitches are temporary!