Someone added me to their personal family sharing

I had to call apple support at 800-275-2273. They will have you go to family sharing to turn it off, which you obviously can't do. They'll then have to send a ticket to their engineers. The first time they didn't actually send the ticket; I called two weeks later and it was resolved that day. Because I changed my billing info as soon as I caught the hack, I was charged a $31.64 in-app purchase for some Chinese app I don't have once I re-added a payment method but they were able to reverse the charges (unfortunately they then blocked my paypal account from my Apple ID for security purposes). I changed my Apple ID and my password and turned on 2-step notifications. So I'm out $31 for 10 business days, had to input my card vs PayPal, and had to change all my account information, but I'll continue to monitor to see if anything else comes up

This doesn't work. It only allows you to set up family sharing, but when you click that it says you're already added to someone's family. This is a special hack that must be solved by the engineers.

Gotta,

You can remove yourself from the sharing group. See this document:

Leave Family Sharing - Apple Support