One more that seems appropriate here:
Microsoft Support – Protect yourself from tech support scams
"Scammers might also initiate contact by displaying fake error messages on websites you visit, displaying support numbers and enticing you to call. They may also put your browser in full screen mode and display pop-up messages that won't go away, apparently locking your browser. These fake error messages aim to scare you into calling their "technical support hotline".
Important: Microsoft error and warning messages never include phone numbers.
…
Help Microsoft stop scammers, whether they claim to be from Microsoft or not, by reporting tech support scams at: www.microsoft.com/reportascam "