I guess the only way to transfer the credits (if possible at all), would be by contacting them directly:
This *might* be possible, but as the others have stated, you would need to contact TrustedCoin and see if they would be willing to transfer the credits from your old wallet to your new wallet.
TrustedCoin service has no access to the funds to make any kind of transfer. all they can do is provide a single signature out of 3 while user provides the other and sign the transaction. so if anything OP has to still create the wallet and then transfer the funds himself by simply doing what you normally do when you send a transaction, create tx, sign, send to their server to be signed and broadcast.
or simply use his seed to sign it twice without needing TrustedCoin at all.