Employment Law Questions? Ask an Employment Lawyer.
You have a few other options beyond what you did.
1. get a restraining order from police.
2. ask police to visit him and warn him to leave you alone.
3. sue for an injunction.
4. lawyer letter warning him to leave you alone.
5. asking employer to not accept calls or other messages from him.
I would suggest 1,2, and 4.
Please let me know if that is clear and acceptable, and if I can clarify anything.
You can further report to HR, but I would be careful not to turn this into you v. company, as could complicate things, and focus instead on the person who is intruding on your privacy and quiet.
Having a lawyer speak to HR is one way to pursue within company, but carries risk.
Please let me know if the answer is acceptable, and if I can clarify anything, ask me.
awaiting your reply/rating.