got a call from this number dont know who it is.

Yeah, me too. This number calls me all the time, the number does not exist on a Google search and they never leave a message. Obviously not an important call - if it were, they would leave a message stating who they are and why they're calling. I'm pretty sure it's a telemarketer or some scam artist.

I got 3 calls from them yesterday. Just breathing. No one is there after I say Hello.
I blocked them today. Caller ID shows Managed nodes. But google shows me nothing.