Chennai Metro Water — Excessive bill for June 2021

I have received a bill for June 21 for 72934.5litres for meter B1.This Valve is closed since13th OCT 2020 since I do not stay in the flat and it us locked.
Meter serial 19738384.Address
K Ramaswamy
Isha Residential welfare Association
12G flat
11 OMR
Contact number [protected]
[protected]@gmail.com
The history also shows 0 cosumption