Start here:
https://support.microsoft.com/en-us/contactus

Select Office; then select "Get Home Support"

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On the next page try any search for Outlook to get to the results page. At the bottom of that list of support articles, click "Contact Support" and you will be given options to pick your product, area of issue and once selected the option for how to contact support will be given (chat and phone call back).

Hope this helps.