If someone complained about my dog’s barking, it was untrue and likely from a neighbor with a grudge against me, how can I stop this harassment?

Someone complained about my dog’s barking. It was untrue and likely from a neighbor with a grudge against me. It is the second time. They filed it both times anonymously. I have multiply neighbors and people who live with me that will testify that my dog is not a disturbance and is quite friendly.