I don't answer calls from numbers I don't know, I am also on the "Do Not Call' list.

I am also on the DNC list, but every time I try to get some info to get them stopped, they hang up.

This time, I played along.  The automated message said they were from "Credit Card Services".  When I spoke to a representative, he asked if I wanted to lower my credit card rate.  I told him I did.  He asked if I had over $4000 in credit card debt, I told him I did. (even though I have no credit card debt.)  I was trying to get to the point where he would ask me personal information so I could question him back.  

But then the curious question happened:  "Are you over 70 years old?"
I replied no, thinking a credit card company would be interested in younger people.  With that, he hung up.  

It concerns me that they are targeting older people exclusively.  My grandparents would probably fall for this-

They keep calling me. I say "Hello", they say nothing. they annoy me.

Got a call from them about 12:30PM today. Did not pick up and they left no voice mail. I went to the FCC site and filed a complaint: http://esupport.fcc.gov/complaints.htm

looks like whomever this is is at it again.....i didn't answer as i knew it was a call from ontario canada....so i called back and a voicemail greeting says the mailbox is full....whatever....obviously whomever this is is up to no good AGAIN!!