Ruby Tuesday review: cardboard in salad

We went to the Ruby Tuesday in Bessemer Alabama on 3/23/16 and my husband made a salad and was eating it and found a piece of a card board box in his salad. We quietly went to the manger to tell him and he came over and took the salad plate and piece of cardboard and said he knew by the shape of the piece of cardboard that he knew exactly what it was (an air hole cutout most likely from a box of lettuce). We did not expect them to comp the entire meal for 2 people but when we were presented with the bill and even the charge for the salad was still on there he was furious. He said he will never set foot in another Ruby Tuesdays again. He said if he had it to do over again he would have stood up and showed it to everyone there who was either eating the salad or planning on it. But we decided that it should be handled quietly so no one was embarrassed. What we expected was for his meal to be comped at the least the salad part. I have the receipt of a copy is needed.