ok let me tall u one thing.......if thats by mistake from BSNL side..they are gonna recover it.......not sure about the time..but probaply in the month of the march to april when they have their annual audit..........i have the same experience as urs.....they demanded me to pay july2006 bill in the apr2007 & which i payed...simply coz twas all legal & thay by mistake haven't added in the jan05 series.........
but still some u can wish sime luck if they forgot.....coz YAKIN NAHI AATA
PS : havn't u paid any money in the advanced b4 booking ur BB??