BSNL — converting my sim from 2g to 3g without notification and expiry of message tariff

Address:

Allahabad, Uttar Pradesh

SIR,
my bsnl sim is converted into 3g without any notification. On inquiring they said "you had recharged by Rs. 1. which i didn't want my message card is expired before due date .

name: vivek kumar
adress:,NIT allahabad ,tagore hostel ,room no. 95,teliarganj
contact no. :[protected]