Complain or not - Disgusting meal?

Please help. Went out to dinner tonight to an american diner with all my fam. Momentus occasion, as one of the youngest offspring turned 10. One of the starters was a mixed platter and it was utterly vile. The chicken wings were grey and smily and covered in hair. Our leader didnt want to complain but I keep getting pangs of nausea. Should I write in and complain or, sorry hold on, just trying to pull a hair out of the back of my throat, or should I just swallow it so to speak? Thanks