Contact AT get the lowdown on what you thought you ordered vs. what you got. Lets call it a fact finding mission.
Mad won't get you anywhere. Mad puts the mouth out front and the brain in the back seat. Turn things around and move smartly with your issue. If it's a screw up, in all likelyhood GC will fix the problem. If you go in swearing and swingin, defenses go up and the smarter guy wins.
Could be an honest mistake,...could be the schmuck behind the counter had no idea what he's talking about, and sure,...unlikely but possible someone's tryin' to bend ya over but in the end, no matter which scenario, my previous paragraph still applies.
Peace, love and all that happiness shit (Steve Vai said that once).