This number constantly calls my cell phone while I am at work but never leaves a message.

I too get calls from this number on my land line and, like the other poster, I never get any response either.

Our annual "EverCare"
"we are going to call you and harrass you into a physician visit"
letter came in the mail a few days ago.
Then the Caller-ID "800 Service" from 866-698-4495 started on a daily ritual a few dfays later.

Apparently, they are outsourcing their calls to this firm...

I for one won't answer it, they are ubber-rude!

If you choose to call back, you will get a recording that an
"Agent will be right with you"
Last year I waited 35 minutes and gave up.
I wanted to be taken off the call list.