HELP FedEx Mangles Speakers - Refuses Claim

I received double boxed with ample foam padding top and bottom - large, expensive speakers that are crushed on the corners and bottoms. I took dozens of pictures while unpacking, have all shipping materials, filed claim, met with claims agent. I did it all correctly and was denied via form letter. Any legal referrals, appeals, BBB, class-action process help etc., is appreciated.