I kept getting lots and lots of calls like all the above. I don't answer the phone either if it doesn't show who is calling; which has been a mistake a couple of times, but aside from that I finally got a phone that has call block on it. Oh my it is THE best thing I've ever done. I get very few calls now. IF a blocked call does try to call (again and again); the phone rings one time then the phone shows call blocked; so I know the call came in but the phone doesn't ring and ring and ring. One place; I think Dial America or Call America calls and calls (well - used to) several times a day. They of course are now blocked; but I looked them up online; they have petitioned to the FCC to be EXEMPT from the 'do not call' list? Really people? I was livid. We'll be in trouble if everyone does that.
So when the calls come in and I don' recognize them, I just hit the call block button and wa-la; done. If I do miss a call, say I' gone, it can be put in manually. The best thing on a phone!