How long ago did you change your user name? The new one and the previous can be cross- referenced for 30 days. If it's been longer than that, you may have to go to Ebay's Live Help, or try their Answer Center.
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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 .