Wesbank early debit order

My debit order for my car with Wesbank usually goes off at the end of the month. However, the end of the month was on Sunday and they took my debit order off on the Saturday. No notification from them, atleast giving me a heads up but no, nothing. I usually get notified about this from all my other debit orders if a debit will be going off a day in advance. This resulted in the Wesbank debit order bouncing back (as I did not transfer any money into that account) and now I have to pay bank charges. All of this could have been avoided if they notified me ahead of time so that I can ensure their will be sufficient funds available. This has been a terrible experience with Wesbank.