Keep getting calls from this number and they won't say what they want and hang up.

No one there, I think this same number called last week trying to get me to buy some kind of training materials from them, I do enjoy this site

just called my business line, same thing. No one there.

This number calls and hangs up without waiting for the answering machine.  We are on the do not call list.

Same here, keep getting calls from this number, no messages left etc. Probably a scammer or someone wanting money.