This number keeps calling my phone and no answer

Despite status on "do not call" list, received multiple calls from this number.  Just pressed "ignore."

I get calls daily on my business line from this number.  Caller ID says NSBA Inc, but I think it is just a ploy to make their acronym sound legitimate at first glance, like they are with the Small Business Administration or something.  It begins with a pre-recorded message for some sort of business credit, and when you opt to speak to a person, the person says, "First we need to verify your information."  Don't give them any!  The moment I ask very nicely how I can be removed from the call list, they hang up immediately - I mean IMMEDIATELY.  Like, CLICK - mid sentence!!!  I called back 3 times in case it was "accidental," but every time, they hang up on you the moment they realize that you aren't calling to give them your information! This has "scam" written all over it.

Called our business.  Caller ID showed "213-570-8368 NSBAINC".  It was a recording from "John".  We get these calls several times a week.  Tried dialing the number back.  A woman answered.  Told her we want our number removed from thier list.  She hung up.  Tried calling the number again, now we get a recording that says "We're sorry.  Your call cannot be completed as dialed.  Please check the number and try calling again."
Caller ID: 213-570-8368 NSBAINC