Additional ammount in broadband bil while the plan is subscribed for unlimited use

I HAVE SUBSCRIBED BROADBAND PLAN 750 MONTHLY RENTAL, IN THIS PLAN UNLIMITED USES OF INTERNET IS ALLOWED AND I AM USING THIS CONNECTION WITH SAME PLAN FROM 20 MONTHS ABOUT.
BUT THIS MONTH RANDOMLY
WHEN I RECEIVED THE BILL AMMOUNT IS 9871 WHICH IS UNEXPECTED I HAVE DONE COMPLAINT FOR THIS ALL IN BSNL OFFICE BUT THERE IS NO RESPONSE AND THEY SAY YOU WILL HAVE TO PAY THIS BILL.THEY DO NOT REALIZE THEIR MISTAKE IN PRINTING THE BILL.
PLEASE SOLVE THIS PROBLEM.

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