Bharat Sanchar Nigam [BSNL] — Fraud message and calls using name of BSNl.

I get a message from the number that I have not submitted my details so my nunber will be blocked in 24hrs.
I get a call from that given number as i tried to contact them. He was asking and forcing me continously to open my play store and download an App "QS". I asked him the whole procedure but he was just asking me to open the play store as he will guide me on phone.The guy was not sounding like a customer care person and the sound of trafic was coming continously so i asked him whether he was from BSNL or a fraud guy. He started abusing me so badly and disconnected the call.
After that I tried to contact BSNL customer care but unable to have a talk so I here.
Please take appropriate actions as I am sending you the screenshot of the messages.