BSNL
Not valid service from 9607920300

I recieved couple of message from number 9607920300

congratulation! you have won either Rs.25000 cash or an ipod or ringtone.call 9607920300 & find out how to claim your prize! rates applicable

I tried once call went for 2 minutes, 18 rupees were deducted without any rewards. How to register complaints about such numbe