M/S BSNL — Call charges for Outgoing Call

Address:

Nellore, Andhra Pradesh

Hello Sir,
This is Ravi from Nellore (Nellore District) in Andhra Pradesh, India i am basically BSNL Pre Paid custmer since 5 years my Mobile No.[protected]
Yesterday i.e., 08.09.2011 i was get a missied call from +[protected] when the phone was rang that time i am in another work after 5 mts later after completion of my wokr i saw my mobile one missed call i.e., from +[protected] immediately i am rang to this number no reply i was called for 8seconds after call one massage came from BSNL i.e., service reply after call charges of Rs 12/- i was surprised and immediately call to Call center of BSNL No.1503 and they told this is call from ISD we don't know from which country like that they told to me when was called to BSNL Call center this was happened at morning again i was call to same above call center and they reply the answer the call from M/s VODAPhone i was surprised i am not able to understand why they are doing like this we don't know? in my office 3 customers (BSNL) only they also received in previously from the same no or other nos but charges they had Rs 12/- within the minuet.
so, i am requesting you please find the above no why they are called to my number first of all how they know my number ? please enqurey please inform to my email id [protected]@gmail.com or phone to my above said number
thanking you

yours faithfully
C.Ravi
Nellore
[protected]