Cannot get into a live chat with support

I have been trying for over a week to get into a live chat with EA support regarding unlinking my Xbox account from 2f********@disabled.ea.com - an email address that is obviously not mine. 

I have only ever had one xbox account and one EA account. Every time I try to open a case, instead of a live chat window opening when I click on the Chat button here: 

I get a response like this instead of a chat window opening: 

 
However no cases show up in my "Your cases" section of EA help despite receiving opening cases  #967715288 #866029011 #806285781 #883465399 #999283356

This is legitimately infuriating and I just want this problem solved - Microsoft support cannot help, and EA support appears not to want to help.