I have called my carrier (Comcast) and they cannot do anything about the 506 number which becomes a moving target, so I cannot block them all. The problem is they fill up my answering machine when I am gone, so after all my futile efforts. I now transfer to a live person, waste their time and sometimes become very rude in explaining I am currently on the toilet and ask if they would like me to explain what it looks like. My goal is if I put them on speaker and waste their time, at least it cost them something. I am frustrated that Comcast and the Do Not Call Registry can do nothing. HAVE FUN WITH THE IDIOTS.

Didn't tell the company name until I asked, then told me "Account Services". "I've never heard of you guys, where are you based?"*click*

Same deal as Greg.  What can be done about this?

Didn't answer when I saw the number.  I too noticed though that it had too many numbers.  506 is the international country code from Costa Rica.  I don't know if this is where the call came from (this is also the area code for New Brunswick, Canada).  I'm sure whatever they are trying to sell is a scam.

A new credit card group that wants to lower my rates with a threat this is the last chance (of course 10 last chances in a months or so). Another moving target so I now follow their instructions to speak to an agent who can help me. I then go into my disabled voice (shouting Helwo, helwo, can you hep me?), this usually goes on for about 3 minutes, I am now starting to enjoy this routine and may add some more to it. Have fun, take up their time.

Didn't tell the company name until I asked, then told me "Account Services".

"I've never heard of you guys, where are you based?"
*click*