Tamil Nadu Electricity Board [TNEB] — reading not taken for the last 2 months

Dear sir,
I am from nagercoil. House eb no :[protected] (Old no : h11 / 145). Name : sophia annie joy.
Last 2 months no one from eb dept come to my house to take reading. Last time i checked in online for the bill payment, it mentioned as rs 610/- and i payed through online.
Today i checked in online and it shows rs 1220/- and i surprised how they mentioned this amount with out taking reading. I went to nagercoil, vadasery eb office and asked the reading details. They are unable to give me the reading details and they said no one in my house during that time. I told 24 hours i am in my house only. Then they said pay this next month they will deduct. With out knowing the reading how can i pay & how can they deduct from my next bill payment?
Last date for bill payment is 15th of this month. Hence i kindly request you
To provide me the correct bill amount as per the actual consumption.
Your early action is appreciated