Maharashtra Traffic Police — Invalid speed limit fine for MH02 CV3209

Dear RTO team,

I was charged with invalid fine for over speed limit on Mumbai pune expressway for my Car MH02CV3209.

i was driving about 80kmph speed and as i i know speed limit on mumbai pune expressway is 100kmph..so how did i cross my speed limit.
And speed cross fine is Rs.1000 than why im charged with Rs.2000..

Please help me resolve my issue.
I was in controlled speed as per guidelines with 100kmph and fine is also not valid for Rs.2000 for crossing speed limit.
Actual fine is Rs.1000.
I should not be charged with this fine.

Thank you,

Jeetendar kundnani.