please help me get my coins out of instawallet cold storage

hello my bitcoins got trasfered from my instawallet acount and I have sent several emails that have not been responded to. transaction: http://blockchain.info/address/1sbXm3rxu3mZ9v9XgmYnQrJgC1YM2fNeb and my 700+ coins have been moved my btcoin address is: 1sbXm3rxu3mZ9v9XgmYnQrJgC1YM2fNeb. what the hell is going on here? no one has access to this computer or account and my url is not saved on my computer its written. please help me this is a huge amount of money for me obviously!
this is so fucked up.
sorry for being a douche earlier guys I am just freaking out cause 700+ coins is alot to lose.. anyways please help if anyone can?