Okay, so I looked at your submission and I can somewhat see why it was rejected. The UVs were intact, so I see no problem with that, but the models had 1.) no materials on them whatsoever, and 2.) there are indeed polygons in random places.
https://drive.google.com/file/d/0BzXe8Uv...sp=sharing (I applied the material myself)
Those pink things are the eyes, but they are not even in the right place. Also, the bones and main meshes are not at their origins. What I suggest is line up all the objects in the way they are supposed to be, and apply their origin at that place. Because when I reset the origin of all the objects, they are unaligned and all over the place with locations and rotations
https://drive.google.com/file/d/0BzXe8Uv...sp=sharing
As you can see, the meshes are not alligned with themselves let alone the bones. So my suggestion would be to manually realign everything and set your adjusted rotations and locations as the origin for each object, and then export your model again for BOTH your dae and fbx version
https://drive.google.com/file/d/0BzXe8Uv...sp=sharing (I applied the material myself)
Those pink things are the eyes, but they are not even in the right place. Also, the bones and main meshes are not at their origins. What I suggest is line up all the objects in the way they are supposed to be, and apply their origin at that place. Because when I reset the origin of all the objects, they are unaligned and all over the place with locations and rotations
https://drive.google.com/file/d/0BzXe8Uv...sp=sharing
As you can see, the meshes are not alligned with themselves let alone the bones. So my suggestion would be to manually realign everything and set your adjusted rotations and locations as the origin for each object, and then export your model again for BOTH your dae and fbx version