I bought a Digitone Call Blocker the best $99.00 I ever spent.  It blocks these idiots, it doesn't ring on my end and on their end - they get hung up on.  The only reason I know they call is the call blocker shows the number and how many times they call.
They are scum of the earth and don't know how to make a honest living.

Modern technology has given telescammers the tools to call you.
Since those telescammers are criminals, they ignore both the Do Not Call list and any request you might make.
Modern technology can also protect you, if YOU do a few simple things!
The first thing to do is buy a call blocker device, service or app.
Then, use it correctly.

Google "call blocker" for more information.
http://goo.gl/cdPm8O

If you cannot afford or use such a tool, then:
* Do not answer calls from unknown numbers ... let them go to voicemail or answering service
* Do NOT return calls from unknown numbers!  All that does is verify your phone number!  And, in some cases, those return calls may cost $20 or more to complete.
* If you have a "dumb" cell phone, assign the scammer's number to a group named "scammers" (or similar).  Then, assign a silent ringtone to that group.

yes - repeated nuisance calls... no response call after call

repeated nuisance calls... no response call after call

caller would not identify himself.

Nobody responded when the call was answered.

Would not respond when call was answered.