Just now called me, however, since I didn't recognize the number, I waited for the answering machine to kick in...they hung up before it activated.
Saw a couple of things on the forums regarding these callers and am using them myself to help ease the nuisance factor, however, won't totally stop the calls. Hopefully these procedures may work for all of you.
For the land line, see if you can run a block on your phone line for numbers you place into it. These numbers would of course be the "scammers" whom you do not want hear.
On my phone system I have two options one for "ANONONYMOUS CALLERS": (no phone number OR name shown) scammers, blocked, private, I block them by using *77 on my phone - it will give you directions on how to continue. If it is someone who is legitimate they will leave a message on my voice mail.
The other option is phone numbers that show on your CALL SCREEN and you recognize them as scammers (or look up the numbers on forums like this one to see if they are): to block, I dial *60 and follow cues.
When I have a new number that rings through then I drop one of the earlier numbers and replace it with the newest, like this one ( system only accepts approx. 10 at a time).
Now the cell phone: place the nuisance phone number into your Save Contact directory>new contact>work>scroll to phone number and save. Now go to the phone number>options>contact details>default ringer>change>and choose "NO RINGER". Now when they call, I'm not disturbed because I don't hear it.
Granted, it may not stop these calls being made, however I'm no longer interrupted and frustrated by them. Also I noticed the old numbers I exchanged with the new numbers are rarely in my future calls, they seem to have dropped off the radar.
Hope this helps take away some of the frustrations.