Repossesion

I had just bought a 2007 Chevy Cobalt about 2 weeks ago. I put 2500 down and financed the rest. Payment were not due until august 2nd 2012. Today at 2 am i had to guy claiming to be repossers with badgeds that i could not verify. I asked them who they were and why they were here they said. I declined by the credit agency. Well if so why was i allowed off the lot with the vehicle after already having them as a lein holder with payments negotiated to a T. They asked for the keys and i said sure i would get them for you then i thought about it and something just didnt seem right so i called to police the minute i got on the phone with the police they ripped both temp tags off the front and the rear of the vehicle and they drove in reverse through the neighbor hood with no front tag so i could not read there liscense plate. WHAT IS GOING ON