Wow, you're not getting the right advice here at all.

I haven't been in this situation, but I believe very strongly that you should consult an attorney before going to HR. There are attorneys who specialize in employment law. They will tell you what to do as far as recordkeeping, the legality of recording these incidents in your jurisdiction, etc.

The thing to keep in mind is that HR's job is to protect the company, not you. They're not "teacher", exactly, and you can't necessarily trust them.

Personally, I think the behavior you're describing is abominable -- besides being highly illegal -- and I hope you sue their asses for a big pile of money. But, whether to litigate or not will be up to you.