Well the number hasn't been disconnected because it just called my cell a few minutes ago (04/22/15 @ 9:24am). I let it go to voicemail, checked here and then added them to my growing auto-reject list.
Same here... when I returned the call, it said the Verizon phone number had been changed or disconnected. I normally would not call back a number I don't recognize but was waiting on a call frm dr and thought it might have been them.