TRAI DND surprisingly helped

I had registered myself under DND long back. But that never helped. I was getting atleast 3-4 calls related to loans, insurance, stock advisories, donations every day. I was really sick of firing slang at those callers. Finally I installed TRAI DND and started flagging every such call. Within few days I got response from JIO that action has been initiated against majority of them. And all of a sudden the calls have come down to zero. I don't know how. It's not that only those set of numbers were calling me. Yet since last 2-3 days calls have stopped.

How is it possible?