Has called several times. Leaves no message.

Here's what I think.
The recording says they want to "verify" the mailing address.  THEY DON'T HAVE IT! I would guess that the first thing they will do is to ask you to verify the correct spelling of your name WHICH THEY DO NOT HAVE!  Then they will want you to verify the mailing address WHICH THEY DO NOT HAVE!
They also tell you to press 5 so they can notify your primary care provider that you have declined the offer.
REALLY!

Received a call from this number last evening, didn't answer, no message.  Have now received three calls from numbers with "458-201-" prefix, and they all appear to be from the medical alert scammers.  

I listened to the message. It is for seniors and SAYS it is from AARP and that the Federal Gov't is issuing FREE medical alert devices to anyone over 65, PLUS $300 worth of coupons for food, etc.  They want you to press "1" to verify with your healthcare provider that your address is correct or something like that. I figure if they don't know my name and my own healthcare provider hasn't already notified me about something like this, it has to be a scam, so I just hung up.

Did not answer.  No message left.
CID:   ALERT