Received multiple calls from this number, with never a voice message left.  Finally, I was available when the call came in, so I answered - no one there and it eventually disconnected.  I called the number back and got an answer with the noise of what was obviously a call center/boiler room.  I was told the call was for a vaguely named children's charity (not a recognizable one).  I asked that my number be put on a do-not-call list, which the rep I talked to politely acknowledged, then we disconnected.  

We'll see if I'm actually put on the list and not called again, but at least the request was received and responded to appropriately.  

they call me almost every day very early in the morning. when I answer it they don't say anything and automatically hang up. it is very annoying and I am getting very upset. .

Paid telemarketers soliciting donations for various charities. I've received two different calls from this number, each for a different charity.

could also be a bill collector, as the caller asked for someone with lots of debts

Has called multiple times and left no message