Hi JSEftl
It is likely a scam.
2018 has turned out to be a year when fake scare sites have appeared all over the Internet with fake ads pretending to Microsoft support and insisting you call them. You need to watch out for these sites. They look like a genuine Microsoft website but they are not.
Warning: There are "Tech Support Scams" pretending to be Windows 10 Support and Activation Technologies. Please be vigilant. Microsoft never calls or emails users to inform them their license is expiring, accounts will be closed or they need access to sensitive information such as passwords or banking information. Neither should you get an email. Learn more in the following article:
PSA: Beware of Windows 10 Activation Tech Support Scams
http://www.groovypost.com/news/beware-of-window...
Report it:
https://www.microsoft.com/reportascam/
Tech support scams - Windows Defender Security ... - Microsoft
https://www.microsoft.com/en-us/wdsi/threats/su...
Protect yourself from tech support scams - Microsoft Support
https://support.microsoft.com/en-us/help/401340...
If you believe sensitive information such as bank passwords might have been compromised, go to another computer and change it immediately. Contact your bank to let them know of any suspicious activities.
Change your other passwords for services such as emails and other important web sites you visit.
Have a notepad near by so you can write down the new passwords.
Enable two factor authentication on your Microsoft Account:
How To Enable Microsoft Two Factor Authentication - groovyPost
https://www.groovypost.com/howto/enable-microso...
Let friends and family know on social media, they should not accept any request begging for money or disclose sensitive information, since someone might be pretending to be you.