Thanks to the numerous promotional calls coming to my mobile phone, I searched for the information on how I can get rid of this menace. Then I reached at TRAI's website that tells if an NDNC (national do not call) registered subscriber gets any unsolicited commercial call (UCC), the called-subscriber can claim a compensation from the service provider, up to Rs 5000. Any subsequent UCC will attract compensation worth (up to) Rs 20000. For details, please refer to this link: TRAI and its NDNC regulations.
When I asked my provider (Airtel) for the above mentioned compensation, they silently declined to me requests. Then I decided to discover, whether I was eligible for any compensation at all! .
To me, at first instance, it looked like the TRAI's clause (as given at the above link) was crystal clear. When looked closely, the word "up to" was making something fishy. I decided to seek more information from TRAI via RTI route. Consequently, I filed my first ever RTI application.
I got a quick response. To my extreme surprise, TRAI (in its RTI-reply) said there's no such provision for compensation!!! The information published at their website and the reply-to-RTI was quite contradictory, in my opinion. They must have understood the issue from my RTI-application but still they gave a very brief response that didn't explain the meaning of their own regulations.
I am still unclear why TRAI has two made such complex and ambiguous rules that are not understandable by common people. Why can't TRAI be as responsible, strict and customer-friendly as IRDA, SEBI, RBI are!
You can see my RTI-Application below:

Response from TRAI is given below:
