Error 193 on XBox360 - Absolutely annoying - have a case open but no response

All I want to do is play multiplayer - had the game for 1 month now and still can't get a response from the EA help team (been 2 weeks) - does anyone else have this problem and do they have a solution to fix?  I have deleted all saved games and downloads started from scratch multiple times - I have no demos loaded - it's ridiculous that if I choose to change my XBX gamertag - only because I had to get XBX gold to go online to play multiplayer - arrrrgh!!!  - why can't EA re-link this new gamertag so I can play the very famous and most special multiplayer option of the most expensive game that I have brought to date.  Please fix this problem - not happy.