I am not sure, but I think you cannot read the survey responses unless you have participated in that specific survey. maybe that's why you aren't seeing the comments?
I would suggest doing a search by keywords. You can get to the search option by going to the option list by clicking on the icon in the menu bar (the appearance will vary, depending on what device you are using).
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 .