Hi, I'm the PM at GitHub in charge of this feature - this feature only charges to organizations/enterprises, not to individuals. If you don't have payment set up the feature will just stop working, I'm not going to come track you down or anything.
Hi, I'm the PM who sent out this email! This email only went out to enterprise admins where there's an org somewhere that has Code Quality enabled on some repository. It's very possible that, due to what you mentioned about adjusting roles and organization membership recently, that it no longer applies to you and we didn't update our filter in time.
To be super sure that you turn it off everywhere if you don't want to pay for it, go to any organizations you're the admin for, and go to Settings > Code Quality (it'll be in the left side bar), say "No repos" for the "Repo Access" dropdown, and turn on enforcement - it'll then turn it off everywhere in the org and stop it from being turned back on (in very large orgs, this can take a few minutes to propagate).