Tim Hortons review: flies all over the donuts and muffins

I just walked out of the Tim Hortons in Calcutta, Ohio because of the excessive flies. The cases with donuts and muffins were polluted with flies. Flies were walking all over food which is so unsanitary. The cases are wide open in the back and need doors on them. The last time I was there I noticed an abundance of flies in the restaurant but not on the food. Please correct this problem.