Sorry for the delay in getting back to you. Has the feedback service started working for you? I made some changes to how it works, although I didn't check the log files to see if those changes specifically fixed why it wasn't working for you. Lemme know.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .