Disgusting food slimy and black hard fish

Purchased 3 pieces of fish and chips on Friday (Buccleuch) - Fish was hard black and slimy inside i have emailed the head office the pictures - when i called the store to report same. The person that answered the phone said that she does not know the owners details and i should come and wait outside the store for the owner. The fish was disgusting .. and the sad part is that we pay hard earned money for the disgusting food. They need to be reported to the health inspector for review