Sorry to hear about the problem you are facing,
If the broadband light is off, then that suggests that the line has a fault and is not allowing a broadband connection.
This link provides some useful information from CL Keith Beddoe:
All I can suggest is that checking the ADSL cable is plugged into the back of the hub and ensuring all sockets have microfilters.
This link also provides some useful info about what all the lights on the hub mean:
Are you connected to the test socket/master socket?
hope this all helps and makes sense,
Have you tried plugging a telephone into that socket?