Tamil Nadu Electricity Board [TNEB] — Excess bill amount in Aug 2021 bill

Address:

5, Dy Mayor Kapalamurthy road

My TNEB connection is [protected]. I was shocked to receive a bill for Rs 8578 this month, Aug 2021. Normally my birthday monthly current units consumption is around 900. Giving below the details.
Reading on 25/3/21, 26850. Usage 700. Bill paid Rs 3100 paid on 10/4/21.
No reading taken in May 2021. Bill received Rs 3694. Bill paid Rs 3694 on 7/6/21.
Reading taken on 28/7/21, 29170. Usegae 2320 which is actually 4 month usage. Difference between reading on 25/3/21 and 28/7/21 works out to 2320. Bill has been made by TANGEDCO for full 2320 units, whereas I have paid Rs 3694. Therefore my bill has to be revised to include deduct the amount already paid
Kindly send fresh corrected bill.