I keep getting calls from this number - they never leave a message and I can't call them back.

2/7/2011..Sarasota, FL.  Didn't answer...call I. D. said "unknown"

Got a call this morning.  I asked who they were calling for and the operator told me the Diabetic Care Club.  I told her that no one in our household has diabetes and to add our number to their own do not call list.  She agreed and then wanted to ask another question--was I on Medicare?  I told her that had no bearing on this particular call and that I was going to hang up, which I did.