Tech Support - MicrosoftUnknown (check 800forall.com)
Outbyte PC Repair, some fake tune up software that displays fake error popups online to scare people into downloading their software which offers 247 tech support.
Screenshot of their popup: https://i.imgur.com/oPpdPqp.png
Hitting em all day
Vouching for this number and publishing it.
Number is active
These pieces of shit are living off affiliate money generated by popup browser-lock page scammers. So these guys basically write tools for scammers to use to harass victims.
Here's a fake Windows Update page advertising their malware