I'm pretty sure you got hit by the old fake cop scam where people obtain your information for the purpose of scams. What ethnicity were they? There's certain groups of people well known for doing this.
If you have any information like a license plate # etc you should report it. Next time either rip them a new asshole or if you think they might be cops, just dial 911 and tell them that you have dialed 911 and when an officer comes and properly identifies himself you will then exit the vehicle and speak to them.
PS: Keep a torque wrench in the trunk, if you want to see why come say hi at the next meet and I'll show you dashcam video of how a torque wrench can help you out when fake cops come your way