because most of these scammers are on foreign soil and not even here in the US. Unless that country is co-operative with us to shut them down, they will continue to call.  It does happen, but we all have to take steps to help ourselves. Reporting the calls here:

https://www.ftccomplaintassistant.gov/#&panel1-1
https://esupport.fcc.gov/ccmsforms/form1088.action
https://complaints.donotcall.gov/complaint/complaintcheck.aspx?panel=2
http://www.consumerfinance.gov/complaint/

And Consider buying a call blocking device or phone..
http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=call+blockers

Called at 1:54 pm. Left no message.

Sounded Asian.  He said he was from Microsoft Windows Support & everytime I sent an email, etc I was corrupting Windows.  He knew my first name.  I asked him where he was calling from & he said NY (but the phone number wasn't a NY number).  I asked him what he was selling & to take me off of his list.  He asked me if I was on the computer now & he would help me.  I said I'll talk to my tech support, stop calling me, & hung up.

Person called from the number above and threatened my mother and her dog. This has been reported to the local law enforcement. This has to be addressed and put to an end. Otherwise I think there are people that may take this into their own hands.

I just got a call from this number.  A man was on the other end claiming to be technical support for my computer.  He barely spoke English.  I mentioned I was on the do not call list and that no one was asked to call about a computer.  He said he wasn't selling anything, just trying to help.  I asked to be taken off their list and hung up.  I hope it works.  Had a similar call last week from a different number.