You used to upgrade 8 > 8.1 through the Store, but that is now closed to 8:
Update to Windows 8.1 from Windows 8
Beginning in July 2019, the Windows 8 Store is officially closed. While you can no longer install or update applications from the Windows 8 Store, you can continue using those already installed. However, since Windows 8 has been out of support since January 2016, we encourage you to update to Windows 8.1 for free.
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To contact Microsoft Support:
Contact support
http://windows.microsoft.com/en-us/windows/contact-support
"Microsoft office locations around the world"
https://www.microsoft.com/en-us/worldwide.aspx
"Global Customer Service phone numbers"
https://support.microsoft.com/en-au/help/13948/global-customer-service-phone-numbers
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Microsoft "agents" are only in Windows 10, 11 and Other/Unknown forums.
Microsoft and its "agents", who are employed by outsourced contractors, never look at the other Windows forums including the 8 forums.
We come here in our own free time and help other users for free.
No one pays us and we have no contact with Microsoft.
https://answers.microsoft.com/en-us/page/faq#faqWhosWho1
Volunteer Moderators
Volunteer Moderators are community leaders who share their experience by answering questions and keeping the community healthy and fun. Volunteer Moderators are members of the community, not Microsoft employees. People who make extraordinary contributions to the community may be asked to be Volunteer Moderators.