United Parcel Service U.P.S Declared Value Scam Anaheim California

Iam hoping someone of can help me by reading this on 05/15/2014 i purchased and printed a mailing label from ups which included $8900 in declared value . ile be brief well the package is deliverd to destination my customer notices theres a slit down side of the ups shipping box. he opens the package in front of the ups driver and a employee of his and a customer contents are missing. ups took full responsibility and acknowldged they were at fault a month of endless phone calls and frustration they only want to pay $500 on the claim im fn furious they and crawford insurance are crooks .ups lies and etc please is there a attorney that can help im poor i cant one but this is Bulls__t how can someone accept responsibility then screw me over  ty for your time