I've already quilted BSNL

and No, you can't teach BSNL a lesson .. they are not here to do business - first they need to satisfy many [ Free of cost connection to many ] including loads of useless employees who only draws some hefty salaries and perks. Even if BSNL wraps up they will get some good pension / VRS benefits.
Customers who really needs, use and pay for their service comes at last. So they can ignore'em any way they like. Other than this BB users who really know the meaning of BB beyond FB or YT [ no offence to anyone ] is very few to make any effect on votebank. The only progress you will see when some one at the govt. takes personal initiative / you need to boast how speedy your nation's BB connection is on foreign countries [ again on higher politicians level - I think you know what I meant ].