Nobody answers when I say "hello" and doesn't hang up.

Received a call from this number twice today.  It appears to be a local number for me, so I answered it the first time.  Sounded like a telemarketer (could hear others in the background), but could not understand the guy on the phone. Ended the call saying I was at work and could not talk.

Got another call later in the evening, but missed it.  Didn't leave a message.