they won't issue it so quickly to the market
so u have a chance
first of all give them a call
may be they will re-activate ur SIM or sometimes they will ask to visit the nearest service point
yeah I know, it's for postpaid and sometimes you we have to pay if it is a vanity (555 555 etc.) number :) & if you know someone inside airtel we can get for prepaid also, no need to pay :) I got 075xxx5xxx :D