McDonald’s complaint: Band-Aid in my sandwich

I work in the medical field at the local clinic and I drive from Idaho Springs to Confer to get home. I stopped by Idaho Springs McDonalds and bought a spicey chicken sandwich, large fries and a large coke. I got halfway home and opened my chicken sandwich and bit into a band-aid that was left in my sandwich. I immediately stopped my truck to pull over and take a photo of the band-aid that was left in the sandwich. I turned around and drove back to the McDonalds and walked in and told them I was recording them to issue a complaint about the band-aid in my chicken sandwich. The manager right off stated that nobody there had any blue band-aids and I said I do not have any cuts on my fingers so this did not come from me. He walked back and asked his workers about it and again stated nobody had any blue band-aids. And I thought to myself, who would confess such a thing even if they DID have a band-aid?
The manager was very rude to me and then went to get the supervisor. The supervisor tried to pull me aside and at that point I just asked for a refund for my meal and let them know that I would report this to the local health inspector, the news and social media. Nobody at that facility wanted to take responsibility for this incident. So, my first point of contact is you. I am making you aware of this incident and hopefully do something about it.