Got a call from this number, no one there, afer saying hello 2-3 times, a recording said "goodbye"

Received a call claiming technical support, representing microsoft and malware info sending error messages wanting me to go to my computer, told him it was not on wanted me to go, start up machine and follow his instructions, fat chance, told to go away.

I got a call as those you see down here. Same questions and no answers. I told him that he was a "bluff" and hang up.

These are scammers.  I'm on the DNC list and have reported this series of calls to the FTC.

The ID on the 1st call read VERTEX 310-559-9211, the caller sounded Indian and said that my windows computer had a problem.  I told him I'm on the do not all list and hung up, there are others this scammer has called -

http://800notes.com/Phone.aspx/1-310-599-9211
http://whocallsme.com/Phone-Number.aspx/3105999211

The same guy called a few minutes later, but this time the phone displayed MGL BPO 213-333-2306 and I was told me would call me when ever he likes. Again I am no the only one he is calling -

http://800notes.com/Phone.aspx/1-213-333-3206
http://whocallsme.com/Phone-Number.aspx/2133333206
http://www.spokeo.com/213-333-telemarketers

After I hung up, he called yet one more time, this time the phone displayed TACCESS 206-397-1126.  And yet again I'm not the only one getting calls from these scammers -

http://800notes.com/Phone.aspx/1-206-397-1126
http://whocallsme.com/Phone-Number.aspx/2063971126

I just got another call from this numer I didn't answer  ID said MGL BPO so I didn't answer. they left no message.  I have goten calls from them before about wanting to fix my computer.  How do we keep these scammers from calling us?