MiWay Debit Order date is wrong

After insuring with MiWay, highly impressed by the ease with which I was given a a reasonable quote, they have attempted to initialise the debit order on the 25th July, which was 3 days before the agreed date of 28th July. I had less funds than the premium in my bank and I understand that this can affect my credit record negatively. I am really disappointed in them, I noticed that it's a recurring complaint with that they don't seem to address.