Penalized for changing debit order dates

I changed my debit order date from the 25th to the 27th via the App well in advance but to my disbelief, there has been multiple attempts to debit my account. What makes it worse is that I have now incurred penalties for late payments and when inquiring this with their support team, I get a copied and pasted response which was not related to my issue making me question if the consultant even took the time to read through my issue. Please look into this because this is day light *******.