These scammers claim to be a Windows support number. Their number is +1 (877) 909-6622 and their website is at http://window-support.us [sic].
They have Zendesk on their website, and if you send a message you'll (hopefully) get a response from somebody named Stacy. She'll go offline for the rest of the day if she thinks you're messing with her, though.
Googled the number just now to see if there was anything else linked to it. Here’s what I got:
http://www.outlook-supports.com/outlook-support.html
https://mi.locanto.com/ID_1314947605/Dell-Support-1-877-909-6622.html
https://www.pinterest.co.uk/pin/662169951433393333/
I also found this video: https://www.youtube.com/watch?v=QWorOjBGTJI
Stacy is online right now, I'm trying to message her.
Stacy's offline but you can still message her. I also just found another number of theirs: 844-883-2946
@drwat#37399
Just called, they're online right now. I think they manually disable the number.