Who called from 2022439231

That sounds like a good idea.

robocall to my cell phone.  I pause for a few seconds before mumbling, "hello."  Seems to confuse the robocaller.  Dead air.  Looks like I didn't miss anything.

Same deal. Someone from India (I assume) says that my number was picked to receive a $9,000 grant

I previously blocked the number. When I checked my blocked voicemail I found they had left an entire minute of just heavy breathing and panting.

Wow!  Very disturbing tohave this number call me 5 times a day. Nobody ever says anything.