First, take a deep breath. Just because they haven’t talked to you yet, doesn’t mean they won’t talk to you.
Second, I would speak with an employment lawyer as soon as possible. Yes, this will cost you money. Yes, it is worth it. NELA can help you find an employment lawyer in your area.
Now, let’s go through what’s going on here.
HR has to take any accusation seriously. They are legally obligated to investigate any claim of sexual harassment.