Bharat Sanchar Nigam [BSNL] — Broadband bill

I Got the BSNL fiber-net broadband connection through the vendor galaxy fiber-net for the plan of 950 rupee, which is monthly 600 GB on march month.From the month am receiving the excess bill amount which said by the vendor galaxy, I have sent an email to the vendor stating same multiple times but no solutions.after a couple months I have reduced my monthly plan charges from 950 rupee to 850 rupee of 300 GB .But still I am getting the excess bill amount every month, when checked with vendor and they said like its an system generated bill so, it will process wrongly since am receiving excess bill amount.I am totally fed up with these type of service our govt is doing.I need proper solution and the justification on the same, I have attached the august bill for your information..

Thanks,
Jeeva M