This festival offer is also applicable in Bangalore as per this news:
BSNL comes up with special offers for festive season
BSNL Bangalore Telecom District on Monday announced special offers in view of Deepavalai and Rajyotsava Festival,including doubling of broadband limit free of charge for existing customers for the month of November.
Customers who have minimum of six months subcription as on November 1 2008 would be offered double usage of free download that is twice what is normally available in the plan. The scheme would be applicable for all broadband plans andis valid for November, Shubhendu Ghosh, Principal General Manager told media.
Source: EconomicsTimes But I couldn't find any such new in BSNL Bangalore website.
I think this offer is applicable throughout India.
I would request all BSNL Broadband users (except UL users) to contact their nearest telephone exchage or the BSNL customer care (1600-424-1600) to find out whether this offer is applicable to them.