There are landline numbers for both MTNL & BSNL, which can be dialed from Mobile or any other phone. e.g. 1800228844 & 22221504 for MTNL Mumbai.
For BSNL (Your STD Code) + 21211500 or 21211504. 1800-345-1500 (Toll Free). Also +91-[color=#333333;]94-160-24365[/color] (Gurgaon/Haryana) or [color=#333333;]+91-94-120[/color]-24365 (NOIDA/UP-W)
Link light can be dead due to several reasons like,
[*]Power Failure or Router
Malconfiguration or anything related to router.
[*]Dead Line because of your fault (You haven't paid Bill :tongue
[*]Dead Line becuase of other's fault (Municipal Corp people Dug the hole!!!)
Just try to eliminate problems from your end. Also stay calm & cool.