BSNL Prepaid — unwanted messages

Address:

Mahbubnagar, Andhra Pradesh, 509210

I am getting the unwanted messages from bt-650500, bt 655522, ba 611111, bt 659797, bt 655678, bt 655678, bt 654000 etc., can you please stop sending it? I feel irritated while seeing these messages. Or send the details of the messenger si that i can take legal action against them, these messages are too vulgar,. My number is [protected]

Thank u sir