I am probably not the best for advice, this harrasment needs nipped imo and consulting a lawyer seems like a good idea. I think it’d help having legal documentation in case it worsens. If they try to hurt your reputation then you have legal backup to sue and get a restraining order if it gets worse. They probably can help not going nuclear first too.
Please stay safe.
FUTO is the only one to my knowledge that doesn’t rely on the Google library but it also isn’t as good.