Serious question about a Voicemail!

Tatum
Okay so my boyfriend and I were watching a movie and it was about 10:30pm on a Sunday night. He looked at his phone and saw he had a voicemail and he listened to it but ended up getting very aggravated. He had me listen to the voicemail and it was of a girl pretending to be someone who worked at planned parenthood and that I had HIV, and  that he was not the father of my child I am pregnant with. One, there is no planned parenthood in my town, I never got and a DNA test for my baby because we know he is the father, and I got tested for HIV when I found out I was pregnant and it s negative. We found out who it was and she admitted it to us. We went to the police and they said we had to go to the county sheriffs department where my boyfriend lives which makes no sense. We plan on pressing charges. Please tell me that she will get in trouble.... I have been told that she might just get a slap on the wrist...