She left a message saying her name and number, but not what the call was regarding.  I called it back and I got the voicemail which didn't have the company that she worked for.  It was strange.

I got a call from this number and they called my work and home.  The person in the message identified herself as Mrs. Scott and left a number for me to call back, but no message what the call was regarding.  When I called back weeks later the same person that left the message answered my call.  I asked her the name of the company and she said it was MediCredit (I think).  When I asked why she would have called she said "lots of reasons."  She kept asking for the number that I received the voicemail on and when I told her I wouldn't give out any personal information to someone that wouldn't even say why they were calling on a voicemail, she hung up on me.

The calls are most likely from Medi-Credit, Hospital Billing
http://www.medicredit.com/index.htm

Calls - says she is Mia - call comes up "Unavailable" on my cell phone - leaves a message to call back at this number, but never says what she wants - just get voice mail when I call the number

Message: "This is Lisa Scott...calling [person who isn't me or anyone else in my home]..." No description of reason for calling.