My old account was also closed by FortuneJack team without notifying me. However, I didn't had any balance on my account. Though I'm not sure, but I think they don't had the system to inform user about the account closure during then. As a result they hadn't informed you about that. Take it normally by thinking that, you bought and put some Bitcoin in your wallet in the past. Now you remember the wallet address only, but you have lost the private key .