i will back joey up 100% on this one. first off, this is a forum, what better place to vent your frustrations.
second, joey would probably be HAPPY not to record some of the bands he does (cough cough someone he just recorded).
third, i've had this happen to me to, i spent a shitload of time producing a band's song, changing parts for the better, spending time with a shitty vocalist making sure everything came out sounding good, and they sent it off to get mixed / mastered (which is fine, no problems) but after they gave me NO credit, and just consistently shit talk me.
plus i charged them $150 for a 12 hour session. people have no fucking sense of respect.