I just want them to stop calling me.  I don't answer it because nothing comes up on caller I.D. so I ignore it.  I figure that if its important, they will leave a message.

Get calls all the time but I do not answer and they wait but do not leave a message

This is a scam. Callers are vague and evasive, and when asked to identify themselves further, become very rude. Have called our office a few times from 800-379-8943 and also from 651-691-4527. I tried to call back to get off their call list (plus we are on the DNC list--if that even matters) but all I get is a recording about how they are going to call me back. STOP WASTING MY TIME. PLEASE.