What? The BBB should have nothing to do with this ... they are not a legal entity that can do shit for you. The Better Business Bureau is not affiliated with federal, state, or local government, and has no direct affiliation with any consumer protection government authority. The BBB, as a privately held corporation, has no governmental authority over businesses.
Call a lawyer.
BBB can do NOTHING to them besides issue them BBB accreditation and revoke it. They cannot do a damn thing to get your stuff back.
Also, listen to this guy, he's trying to help.
If the police are in fact involved, and they know the business is operating illegally, what they (the towing company) did would be considered grand theft and possibly extortion as well, if they don't have a permit or license to legally operate. It would be like me stealing your van and demanding you pay $1000 to get it back. If I did I guarantee I would get more than a ticket. Something is fishy here, it doesn't add up.
Get a lawyer involved immediately, you are getting screwed over here, by not only the towing company, but the police as well, if what you are saying is true.
I'm not calling you liars, but the statements you're making don't add up.