Hi dweagle. I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.
Since you've come to a site where we have actual experts rather than Support agents who work from scripts, perhaps we could help you so you don't need to worry about calling the wrong number. But if in doubt you can reach Support from this list of official Customer Service numbers: https://support.microsoft.com/en-us/help/405170....
What is the exact problem you're having with activaiton? How was Windows 10 originally activated? How did it come to be deactivated, by reinstall or any other change made? What is the Status and Edition showing at Settings > Update & Security > Activation. Have you run the Troubleshooter there?
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.