BBs are not that much costly Vadirocks bro only @ 500 pm for rural and 750 for urban is starting
Use http://mis.bsnl.co.in/pgs/internet/pgwebregn.asp they setup new exchage for a single person too and it goes to higher authority and also complain on :: Grievance Redress Mechanism in Government :: under telecom dept , also right a long brief para about your request to setup a new office and broadband connection , am sure they will do it within a month.