Mahanagar Gas — complaint about sudden increase in the bill amount (almost 300% increase)

Address: Thane, Maharashtra, 401107

My average bill of every month from the time i have taken mahanagar gas connection is between rs.1600 - rs. 2000
But my my oct, 2019 bill is rs.8000 which is not at all expectable. There can't be any logical explanation for this much increase.
I have connected with all there touch points but no one seems to give any solution or even a bifurcation for this bill and even threatening to pay this or else they will cut the connection which is not at all exceptable.