Okay, I have checked, I can confirm you have no publicly displayed playlists.
However, I can see social activity showing on your profile, which shows you created a playlist on 12-02-2013 which must have been created publically and therefore I can access that playlist through your social feed. It also has 1 follower, so I am guessing this is the playlist you are talking about. Just be sure that you untick the option I pointed out earlier in your preferences and that won't happen again 😉
If you want to make this playlist dissappear, just untick the public publishing option in your preferences, make a new playlist, copy those tracks into the new playlist and then delete all those tracks from the original playlist, and then delete the playlist. Your account will be completely hidden then.
Hi there, I'm having a similar problem. I started a playlist weeks ago, set it to secret and now some fool's subscribed to it. Do I really have to delete it and start it again to get rid of this guy?
Unfortunatley yes, there is no way to force remove followers. Are you sure it was secret, the only way I can think they would have been able to find it is if they had a direct link to the playlist from your account.
If you want to delete it, be sure to remove all of the tracks and then delete it, since just deleting it won't actually remove it from the other persons playlists either (it just breaks the tie to your account).