IMO, the natural choice here is: 'got'. Here we have one action that led to another one and the second one followed the first one very closely, so there is no need to use the past perfect, particularly you used it to indicate the first action here: 'had already started'.
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 .