As we have mentioned earlier that the bitcoin address generated is only a sending address and not a receiving address. On checking, we do not find that 16jM4mbzPQsPAxhbVk5pt9FAK9xCGm1m6m is linked to any Mt.Gox account. Therefore, it was not us who removed it.
That doesn't sound right to me.
You sent coins directly from MtGox to SDICE, so all the addresses that the coins in that transaction came from must be in Gox's wallet. There are "sending" and "receiving" addresses, there are only addresses. Gox either has the private key for that address or they don't. The fact that they sent coins from it means that they do.
They also say that the address isn't linked to any Gox account, so your winnings wouldn't have been credited to anyone's Gox balance. Therefore your winnings are sitting in Gox's wallet, but not counting towards anyone's balance. They should be able to refund you without being out of pocket at all.
This address may actually be linked to a non-Mt.Gox account and the person who has access to that bitcoin address may have removed it.
This makes me think that the person you were talking to doesn't understand the situation. The address was used by Gox to send coins. That means they have control of coins at that address. I would ask to speak to someone else if I was you.
Feel free to use my words if you think they help support your case.