Its a scam. You don't need to respond to him. Don't answer calls from him. Delete any messages he leaves. If the calls are annoying you ask your phone company if they can be blocked.
Verizon charges to block calls. Other companies may, too. If the scammer is calling your cell phone you can put him in your contacts list and assign him the ring tone "no ring". That won't stop the calls but it will make them easier to ignore. Thats what Verizon told me to do when I was getting bill collectors looking for Michael the Deadbeat.
This guy could barely speak english and despite my continuing to tell him he was being recorded and to not call my number anymore and hanging up on him, he kept calling claiming to be from an attorney's office. I finally told him to ***** himself and he told me that I was going to be arrested if I did'nt pay him the money I owed for the company he represented. Again I could barely understand him and I finally told him go for it, if he had the balls to come down and face me himself. I have done this for several days now and surprise I am not in jail because he is full of it. I have reported the company to the BBB and the FBI it has not seemed to do very much good I, can only block so many #'s. The best way I have found is answer the phone not say a word and set it down until he hangs up.
Today I received a message on my phone from this number. However this same guy with an arabic accent has called me on three separate occasions. The first time, he was David and was calling on behalf of a client because I owed money on some PDL I didn't take out. The next week, he was Officer Jon Voigt and made the same claim that I'd better get a lawyer or I would be stuck facing some awful consequences and the second I received the message I needed to call him back. This morning I got another call from this same person only he is now Officer Daniel Blatt and gave the same ominous message that if I didn't call back immediately the situation would unfold and there is nothing to stop it. They have called me at work, and on my personal cell phone. I block them for awhile, but since they keep changing phone numbers it only works for a bit before they get another number. Very irritating and wish they would leave me alone.
Been ignoring calls from this number for a couple weeks, but finally returned the call today. Same story as everyone else - going to be arrested, being brought "downtown," get an attorney, blah blah blah. If this was a legitimate company with a real case, they'd be taking action instead of making prank phone calls :)