Mahanagar Gas — Wrong billing March 21 and May 21

Address:

Mahanagar gas Ltd,Bandra kurla complex ,Bandra Mumbai 400051

CA :[protected], BP:[protected], Meter no :[protected]
Dear sir,
In the month of Jan 2021 I recived a bill showing closing reading 813, Subsequently my premises were locked rom December 2020 till today .
Surprising I recived a bill in may 2021 closing reading 811 for Rs 1317/ When in Jan 2021 reading show 813 it ckearly shows gas was not utilized from Jan 21 .
In view of the above rectify my gas bill, amd charge mimimum amount from jan 2021
Thanks
Gloria Viegas