Stalking victim (my kids now) need guidance!?

It’s been over a year since he’s been out of our lives but still the attacks continue. Now he’s after my kids using social media and false allegations to school officials their friends etc to ridicule and humiliate and emotionally abuse my kids. What do I do when the police NOR DOES AN RO seem to hold up in this one red light town.
I could write a book on all he’s done to me directly but now his onslaught is targeting my 17 and 13 year old directly. I need help. My babies just lost their father to Covid they don’t deserve this.