Sorry to hear that you've been running in to fitment issues. When I used to frequent a performance shop many years ago that was a Seibon dealer (when Seibon first got introduced in to the scene) they brought in many hoods and carbon fiber pieces that had fitment issues, the piece was thin and brittle, fading/yellowing issues, or the weave quality looked extremely sub-par. I had hoped they fixed the quality issue being that I've seen them move in to the dry carbon fiber market but apparently not? Still another "Made in China" piece.
Keep hounding them until you get a quality piece or a refund.