You're either console ID banned off of Ghosts, mac address banned off of Ghosts, or both. Try changing your PS3's mac address first, after that try going onto ghosts, if it still says that the console device has been banned then you're console ID banned off of Ghosts. If you're console ID banned off of Ghosts you will have to find a console ID that hasn't been banned off of Ghosts. Remember that console ID selling/trading/buying is prohibited on NGU. Here is a tutorial on how to change your PS3's mac address:
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