Hire a lawyer to send a cease and desist letter to the owner of the page that is trying to impersonate you. Most likely they will see the law letterhead and shut it down promptly from fear of legal action.
Involving a lawyer is very important if you want swift action on your problem. Sometimes just the idea of being dragged into court in front of a judge is enough for people to do what you say but if you thratened them they wont act on that alone. You have to get a lawyer to give the proper procedure of notifying them about a cease and desist before you take legal action.
Unfortunately the only time you can get someone who is out of control to listen is when the cops or a lawyer is talking to them. When you feel that your right have been violating by an online predator just contact your local lawyer and explain the situation so they can properly handle your case. You will not have to go to court and waste your time because they know they will lose so they just listen to the cease and desist letter.
Amazing how fast people will listen these days when threatened with a lawsuit. It seems like everyone barks louder than they bite because they all spout off comments about how they know their rights until they are presented with a cease and desist then they keep that big yapper quiet. Lawyers are like the grim reaper to some people and they beg not to be dragged into court so they comply with whatever the paper tells them to do.
Well I think that you are basically telling them that you have a legitimate case against them and will follow through if you do not stop what you are doing so yes if they dont take it seriously it will be a dark mark on the case when they are in front of a judge.
I've heard a lot of C&D's way back, this happens just about everywhere else. I don't think it would be applicable on facebook but there are some who's able to get away with it and there are some who is just so hard-headed that they don't care about a C&D letter or notice.