I don't understand how this has slipped to what is now a perilous position with precious little info. But you are where you are.
Today is day 28, the last day on which you may submit reps which require consideration, after today the council may disregard.(PCN issued 12 July therefore deemed served 16th which is day 1 of 28).
Frankly IMO just submit anything, even if it's that you were distracted by children, apologise and ask them to exercise discretion. Do not try and shift the blame on to RingGo or the council, you are asking them to exercise discretion.
In your first post you suggested that you might receive a second PCN. What's the current position?