McDonald's

On 25 May 2015 I stopped at the Love's Country Store which has a McDonald's. I went through the drive through. While attempting to bring the drink into the car window I accidentally knocked off the top and spilled the soda on my lap and on the inside of the car door. The manager, who happened to be working the window, offered to put a new lid on the cup and took the drink back, then handed it back to me. I found the insects (two flies) in my drink when I accidentally bumped the lid off. I drove back to the McDonald's location to submit a police report about the incident but was told by the officer that arrived that I couldn't. I'm really not sure why. Does this mean that this location is free to put things in people's drinks without consequence?