Why I am seeing estimates for usage when I am submitting meter readings on a regular basis?
It depends on the date of submissions and the date of the monthly statement.
In my own case, for example, statements are issued on 17th of the month, based on readings submitted on 15th of the month.
We need your reads before we send the statements over, so in your case it would we on the 29th/30th/31st of the month to ensure your read is shown as the last read on the statement.
Your read this month was sent at 8 am on 2nd July, when your statement was sent on the 2nd July at 1 am, so the reading was too late.