Mahanagar Gas — Mistakes in billing

In feb i have paid the bill up to units 131
Though i paid i am getting and paying bills for use up to 113 and 123 units from last two bills.
I have complained last time also.
But no action or reaction.
Hould i forget my 947 rs?
Is there anyone to rectify?
My ca number is[protected] mahanagar gas limited.
And one complaint for you people too. Why do you want more words?