Please see the "sticky" post I placed above to address this. You need to change your notification settings. Apparently, your profile is set to email you for any survey posts or responses.
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 .