Hello, thank you for reaching out to Microsoft Q&A.
Microsoft will never display a phone number on your screen and ask you to call it to fix a security issue, unblock your device, or recover it from a hack. If you see a message like this, it's a scam which is commonly known as a tech support scam. Don't click anything on the page, don't call any number shown, and simply close the browser tab or window. If it won't close, press
CTRL + ALT + DELETE keys on your keyboard.
Open the task manager.
Right-click the browser process and select ‘End task’.
You can then clear your browsing history, cache and cookies and secure your account.