If you decide to order a repossession agent off your property and they refuse to go, you should call the police. But be ready for trouble. Often the police are inadequately trained to deal with repossessions. They will sometimes try to judge the dispute and may even order you to hand over your car keys. This is illegal. Contact us if this happens to you. The job of the police if they come to your residence is to remove the trespasser from your property, not act as a judge in a driveway court.
*Note: If your car has been repossessed in Massachusetts, we might be able to help. However, due to high call volume after I posted information here about Massachusetts car repossession, we must first receive the completed form found here: http://www.mass-legal.com/repo_quest.asp. We will review your matter confidentially and free of charge.