I too had a deposit that went to the wrong Mt Gox account, in November. I actuly got Rachel and Charlie to respond to my emails for a few weeks. Mt. Gox has always been responsive at least.  My funds were frozen, they were going to fix it, blah blah blah. Computer issues, then someone in Japan was deathly ill. Then....nothing. I'm telling you, they;re going to steal your money. Do not use bit instant again!