Data harvesting company. Don't pick up or call back; they'll treat the number as dead that way. They collect names and such on the premise that they'll help you find a job.
I don't answer numbers I don't know, and this is one of them. I was receiving calls from this number at least 6 times a month. I finally decided to answer and it's this automated person saying to hold the line and it rings through to a human, that then says 'hello how may I help you?'. 'How may you help me?? You called me. You can help me by not calling any more'. Then they proceeded to tell em they'd remove my number from their list, but they haven't because not a week later they started calling again. I don't know what to do. I never found out who they were or how they got my number. I JUST WANT IT TO STOP!!!!!! Everyone beware!!!!