Network Unlock Request Unsuccessful. What Now?

So made a pretty bonehead move. Long story short used the imei number off my box forgetting i received another phone. So after using cellunlock for a code(which was obviously wrong) i couldnt get the phone unlocked. I got a free code from at&t after using the right imei number off cell phone but it will not work. Im still getting Network Unlock Request Unsuccessful. From what I read on previous posts im pretty much screwed. however those posts were from years back. Is there anything I can possibly do to unlock this cell phone?

Any help is appreciated. Thanks

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