Tamil Nadu Electricity Board [TNEB] — charging higher unit than the consumption

I'm residing at 15/2 New byepass road, Mannargudi.
My service no. [protected]

I'm a tenant staying at the above address since August 2019. Last month our EB meter was repair. So, they have changed the new one. Hence, they couldn't calculate the meter reading.

Now they have decided to put random unit of 850 amounting to Rs 4365/- They are saying it is the average of hightest two units in last one year. But I get into this house on August 2019 only.

So, how am I responsible for this much higher charge. I'm not using air- conditioner. I am a single person staying in that house.

Kindly help me in this issue