Best answer by woz
just submit readings in the normal way now (and again when you get the reminder) and your statement balance will correct.
If you go to help, ask wattbot, type message the team, and explain there PP will adjust your DD back (assuming your usage is on track with your original quote).
Replies are not instant (24 hrs exc weekends)
(Your October payment would have increased anyway because of the Summer/Winter split)