Changed D/O date and they still debited acc

Let me start off by saying as a loyal Standard bank customer im pretty upset with this sort of service as it has happened before. <br> On the 16th of May i called General enquiries in order to change the debit order date for my credit card. <br> I cannot remember who i spoke to, at the time the consultant was quite friendly and very helpful. I wanted to change my debit order date from the last day of the month to the 10th of the month, he consultant then confirmed that he had done so, i had continuously asked if it would be in time to be effective this month, as in i actually asked \so no debit order will come off the end of the month? it will be the 10th of June"in those words (calls are recorded right"