A person reads every message. Email support@balladlabs.com with what you tried and roughly when; we reply within one business day, usually much sooner. Include your Slack workspace name and the Ballad workspace you're signed in to.
Disconnect Slack from Ballad under Settings → Notifications; Ballad revokes its token and stops posting immediately. You can also remove the app from Slack's own app settings. Ballad keeps no Slack message content and no member emails — it reads messages addressed to it to answer them, and matches your email to your account at the moment you ask. What Ballad does keep about your workspace is described in the Privacy Policy; email support@balladlabs.com to have it deleted.