To automatically remove a listener's access from a feed, you can use the Hello Audio Zapier app's "Edit Listener" step, then set their status to "Inactive". See the screenshots below.
These are all in a Hello Audio step after the trigger of your Zap. Something else has to trigger the start of the Zap to tell Hello Audio to remove the listener.
You can follow this Zapier template to block a listener when they cancel a subscription in Kajabi, for example.
You can also watch this video which uses a Kit form as a trigger to block a listener. The blocking portion begins at 6:10 in the video.