2 calls today, spoke with my 14 year old son.  They knew mine and my husbands name, and said they would call back.  I attempted to call back, no dial tone, just silence.

This is a telemarketing firm that trys to sell everything from berry juice to colon cleansers. If you answer they will try to sell you something that you don't want and will then call you about other things. I have reported them to the DO-Not-Call list people several times but they keep calling using different numbers. I have a policy never to answer a number I don't know but apparently my wife doesn't have the same policy when answering my cell phone. I guess that will teach me to leave the bloomin' thing out. So now they call at all hours of the day and night, several times a day. At one point they were calling every hour for days.
I finally had my cell vendor to give me another number.

just like everyone else, rings & no answer or voice mail

about 2 a day as well.  It's been going on for a week or so now.  I never answer.

I get two to three calls a day from this number, but never a message.

I got three calls in one day, and never a voicemail.