Response
I am not an attorney.
You should do what many people who have their identities stolen do - first, report this to all three credit agencies, Transunion, Equifax, etc.
Have them put a fraud alert for identity thef on your credit file. This should require (or at least encourage) creditors to contact you at home before accepting credit cad application, loan apps, anything that someone moght try to get in your name. It also notifys creditros that someone might be posing as you.
Second, make sure you are shredding your mail and any important papers you are throwing out. I located a debtor just by going through her garbage. And just don't single shred it (can be pieced back together), but get a particle shredder.
Get a lcking mail box if you don't have one.
Ask yourself, "How did this person that is now threatening me, get my personal onfo to begin with?"
And remember, this person has just informed you of who to look for first if things start going wrong...
Good luck!