BSNL broadband is just having a name broadband in it, otherwise its works like simple BSNL internet plan. Nothing extra in it. And also the internet disconnect after some time. Customer care are bunch of fools who are there not to assist you, they are just having a salary in free. Call is neither picked by the customer care nor are the mails seen by them.
The only way is to go to branch office for complaint or close the connection. Even they do not bother you if you close the connection. They have lots of money. I have tried and take the headache already. So beware of there so called broadband plans.