Support
Unison is made by one small team, and mail here is read by a person rather than a queue.
Something is broken
Write to jose.lopez@10xsdevs.com and say what you were doing and what happened instead. A screenshot helps more than anything else. If it is about a particular record or artist, name them.
A record or an artist is missing
Search for it in the app first: if Unison does not already hold that artist, searching brings in their discography automatically. If the results come back with the wrong thing, use “Not what you were looking for? Bring it in” underneath them — that asks the archive directly. If it is still missing after that, it may not be catalogued anywhere yet, and mail is the next step.
An album has the wrong tracks, or a track is missing
Worth reporting. Unison's catalogue comes from MusicBrainz, and an album with fewer tracks than it should have is usually a fixable import problem rather than a limit of the data.
Deleting your account
Profile → Settings → Account → Delete account. Immediate and permanent. No need to ask us.
Privacy
What Unison collects and what it refuses to do with it is on the privacy page.