Plastic on my burger is a major health risk!!

Went to McDonald's last night and bought a Mc Feast Meal and more.. Got home, opened the burger (which we dont normally do) and found a nice BIG piece of plastic between the source. It looked like one of the fingers of the cloves they use. Went back to McDonald's and they asked us to replace the meal, which was not an option and tried to bride us with a chocolate milkshake!! This is ridiculous! This unfortunately is a major HEALTH RISK. Someone needs to eat that burger. I took photos of the burger as proof. This is unacceptable and very disappointing!