BSNL — Bsnl sim block not taken

Address:

Kolkata, West Bengal

Dear BSNL
Authorities, I My self Sudip Bhaduri .i just lost my mobile on a local train.after that i am continuously calling to BSNL Care [protected] no they are asking me about the name of that sim owner which i am right, bt after that they asked me hw much balance i hav on my ph. i am telling him that i didn't remember bt approximately hw much i wl speak to you, after that i am speking him my validity correctly bt they did not block my sim.honestly speaking after a alot of request they are not block my sim.if any illegal activities will happen in the name of my sim then how could i prove that it was not done by me.
On your reference-
My Mobile no-[protected]
My address-Behala.Please block My sim card