Use truecaller and keep on blocking the numbers. After few days the calls will reduce. I did the same and it worked.

+1
Start giving out fake phone numbers when you aren't liable or don't need an OTP

Consultant

Equity Research

Turn on dnd with your network operator(can be turned on in their app myjio or airtel,may be this helps out.

Hey folks,  As you also may be quite irritated by all the spam calls you receive, what steps have you taken to free yourself from this abuse?   I have a Pixel phone, it does a good enough job of sc...

Hey folks, 
As you also may be quite irritated by all the spam calls you receive, what steps have you taken to free yourself from this abuse? 

I have a Pixel phone, it does a good enough job of screening these calls, however at a daily rate I receive 10 spam calls.

Spam calls : How to get rid of them?