Login to your service provide. Find the list of calls; click (or right click) on the call; select "block" menu and block the MF for good. Hurt them where it hurts the most by blocking them.
These idiots called saying they were from Microsoft Tech support and that my computer was sending them warnings. I asked what I was supposed to do about it. They said turn on my computer and she could help. I immediately got upset and cursed them an new [***] and told them I knew it was a scam and if they called me again that I would report them to the authorities!
I have two phone lines (personal & business) and a fax line. All three rang at the same time showing this number on the Caller ID. The three numbers are not related sequentially so almost seems as though the scammer got them via my phone billing. I did not pick up any of the lines.