rude phone calls

I received a voicemail today and it directed towards my mom. I dont have my name on my cell phone voicemail so it doesnt let someone know if its mine or her or whoever's number. But they left a bunch of information on her, saying she's involved in some check fraud case, and theyre going to serve papers, etc.. Now I used to work for a bank doing collections, from what I understand.. isnt that illegal to give out that information? Let alone on a voicemail so anyone can hear? And they also tried to say me and my sister n law were parties involved. I'm assuming its all scare tactics, but how much is that illegal and what can I do about it? I dont like them trying to involve me in it.