called me, no message

called left no message.

several calls the last few days from this number.  they leave no messages and hang up if I answer.  Finally tonight she said she had papers and wanted me to give me a legal dept number and case file number.  This one did give me her name (bogus I'm sure) and stated company name was Docufile.  She refused to tell me where she was calling from.  I asked because I have been getting these calls from all over the US lately.  once they said they were callig from one state yet caller id said another. they said they had legal papers.  they get very hateful.  give them NO information and do not call the number!   I'm guessing this is a scam!  If not, I would have been served by now.  All the other phone numbers report same "crap" as I just did.