The only thing I can say is that fortunately, you can play as Dare Devil and Black Panther in the Sim Missions to unlock their costumes. Otherwise, attempting to 1000g-ing is a waste.
Since you said that deleting the save file didn't work, this could only mean that it's attached to your Gamer Profile, which is a stupid thing a developer could implant, this being the case.
To a person who wouldn't know that their unlockables would not appear, such as Dare Devil and Black Panther, they would have no way knowing that reloading could possibly fixed this.
I played the game as normal, got all five action figures, later saved the game and later thought "Oh yeah, I forgot I unlocked Black Panther", went to the Change Team and POOF! NOT THERE!