it is a collection co. I asked for their address and they will not give it to me. I asked them to put the collection in writing and mail it to me and they will not do it either.

Why does this number keep calling me?  They never leave a message who they are and it is to the point of harassment!

They call me every few weeks and on the day they call, they'll call multiple times. I never pick up. The voice-mail is always 2 to 3 seconds long of nothing.

Received call from this number, but no one on the other end would speak...complete silence.

I got a call from these people as well. Said something about having unpaid medical bills or something like that, which is weird since I'm 24 and have never been in the hospital before. Then when I said let me call you back he quickly hung up without giving me any call back information. Is there a way to know for sure if this is a scam or not?