Chandler, EY employed you to fly the A320
Does your contract have a clause saying that EY cannot employ other pilots on other fleets (A330, A340 or B777) before they offer you a slot on those fleets?
Didnt think so, I therefor suggest you stop acting like a spoilt little brat and get on with it. At the end of the day if you dont like it please feel free to pack your bags and kindly bu@@er off.