Just received a phone call from this number and no one was there. Had already registered the Do Not call . Tried to dial it back but operator said it can not be called. Who is this?

Hangs up just after three rings.......so that answering machine will not pick up.

They have called me every day. I, fortunately, have caller I.D. so don't pick up, even tho my caller I.D. says local call. They don't leave a message on my service.  I looked the number up and it is based in MIAMI!!!  Not close to local. And don't these jerks realize most people have caller I.D. and won't pick up?  

I have gotten 4 calls from this number within a 2 hour period.  I am on the do not call registry

They've called me multiple times a day for the past few days.  I've pucked up occasionally but no one is on the phone -- must be a ribocall -- so I hang up.  I wish I knew how to block the call.  I'm on the DNC Registry, as well.