False complaint of bribery on me

I being a resident of my building have registered Legal complaints to many departments like municipal councils, Police , Fire Officer against an unlawful restaurant encroached building premises keeps open gas cylinders causes nuisance by smoke illegal chimney etc, no health license in our building premises. After that complaints and many applications and reminders to departments they r now initiating some sort of actions against the restaurant operator. Now the restaurant operator still by his influences keeps all the things as it is and he raised a complaint on my son who studies in college that he demanded him money and nextly he wrote in complaint that I had raised complaints to all departments and he is stressed for it . Now the allegations are totally baseless as frankly speaking we have never been into contact with the restaurant operator and never had a single word with him i m just taking legal action against illegality. I have showed all documents pictures to police officer who called me on his complaint , even he got surprised and he didnt took any action on me. Now what should I do for the false allegations & future proof ?