Called and hung-up at 9:15 am this morning.  No message.  Thanks for the above posts.  So many back and knee brace scams lately!  I got two, so far today.  If you are a senior: scammers can get you from a list.  (I HOPE not from Medicare or CMS)!  Anyway the chances are that we could have knee and back pain so we are natural targets. (In my case everything hurts)...  These constant calls certainly are a PAIN in the A**!