How to stop spam calls

There is a section on under help to get it stopped

just raise a DND request VIA twitter/ email 

They stop it 

@cpxfer -- I used to continuously get calls from Bajaj Finance. I started blocking the numbers and after good 2 months, I'm happy to report that now I hardly get a call from Bajaj Finance. 

Looks like I blocked every possible number 😄

Copy pasting my comment from other thread..

"If your Network is Airtel..Raise complaint through DND app By TRAI..

Airtel is very strict in Blocking These Spam Calls..

I have raised almost 30 complaints in last 3 months.. Airtel Blocked Most of the Marketers and Put Usage Cap as first warning {20 Calls Per month} on other numbers..

While jio ..most of the time They Close the complaint in favour of spammers {marketers} .. stating the reason as NOT PROMOTIONAL NATURE..

*This is my personal experience..

"

Did bajaj bought spectrum in any auction for this sole purpose?