I can't help with the actual issue of why you are unable to emote - well, except to say that it is a known issue that not all emotes work/work with all classes (pre-Cartel Market/FTP days, as far as I can tell).
As for other points:
1) CS have to prioritise tickets and surely OP you can see that an emote not working is pretty far down in a list of character affecting issues? (If it needed ticketing at all considering we have a general /emote (/e) that works however you want it to).
2) To the second poster, the Cartel Shop emotes come from the rare packs; you can't specifically buy them, they are the luck of the draw. I got the angry mood emote in the one pack I purchased from my stipend points - it sold very quickly on the GTN too