They leave voicemails from +1 (800) 297-4166 :
“This is an emergency call to notify you that subscription of your Microsoft Windows computer has expired today all Microsoft services on your computer will stop working by end of the day contact Microsoft toll free”
Each and every time I call them it goes to voicemail and they ask you to leave your name and phone number. So fill up their voicemail with junk calls so they can’t get any victims https://bobrtc.live/phonebook/dial/18002974166 (you can farm this number to earn easy Credits/XP)
800-297-4166 | 18002974166 - Phone Scam Alert! - Nomorobo
https://800notes.com/Phone.aspx/1-800-297-4166