Government call center to add your name to a voice recognition database.

I received this call at 11:09am 07/23/14.  I did not answer it and they did not leave a message.  I recognize the number as being one I had received before.  How can I get a number put on a NO CALL list?

I did that too.  It is so nice that it automatically hangs up on them.

I just got out of surgery - my 7th back surgery - and I've been bugged with phone calls from this number.  The person calling me was rude, was telling me that my disability attorney was crooked and was going to take all my money, that I was stupid and then right before he hung up he called me a "B^#%h".
I called my attorney's office and let them know that they were being slandered.  My case manager called the number and said that the woman answering the call didn't even ask anything, just started with her script and that when she asked the name of the company the lady said Health Advocates and started with her script again. The call was disconnected right after that.  
I think they're scammers.  What can I do?  I need time from my surgery...not answering these frustrating calls!

Scam number