The 2FA wallet is using 3 signatures, where only 2 of them are required in order to fully sign the transaction. Your seed contains 2 of them and trustedcoin holds the third.

Your current situation is that you hold only one of those 3 in your wallet.dat, Since your seed is not correct then you can forget about the second one forever.

Your only hope now is the third one held by TrustedCoin and i don't know if they will be willing to provide their key to you at all as it will just make the whole service meaningless.

You can try though to contact them and sign a message with the key you hold to prove you hold at least that key and maybe they could co-operate.

It seems very strange that you missed saving your seed and also lost your authenticator code. If you were using Authy you can still retrieve it back even if you lost your phone. Let me know if this is the case.