I have been fighting the UPS store on Elysian Fields in New Orleans for six months over a Damage claim, what do I do?

I had the employee at UPS (My first mistake) pack a Piece of Art I had sold for $9000.00. I usually pack everything myself but decided in case of any damage, I would let them be responsible. Well the packer neglected to put a covering over the painting and adhered the tape directly to the 80+ year old picture frame. When it arrived at the customers house and was unpacked the tape pulled off plaster and patina greatly devalueing the work of art. Six month later thay are still giving me the run-around. I have submitted all the paperwork several times and now they want their own local person to do it or they will not honor my claim or pay me. I think it is the owners responsibility of the Franchise and his insurance company but he claims no fault. Do I have to sue him? Is there a Lawyer in New Orleans I can talk too about this?