Greenwood Towing and Driveway Service, Inc. Working in Baltimore City with Permit displayed clearly in vehicle window, Greenwood Towing charged $155.00 to drop from tow truck. Baltimore, Maryland

The company I am employed with does a lot of work in the City of Baltimore.  On at least 3 occasions where employees working on job sites with City Permits clearly displayed, Greenwood Towing has hi jacked the vehicle on their tow truck, forcing employees to pay cash from $155.00 to $250.00 on the spot to lower the vehicle and not tow vehicle to their facility.  The employee pays the ransom because they are told they will have to pay over $500.00 to get out of impound facility.  Greenwood Towing and Driveway Service is running a scam in the City of Baltimore and getting away with it.  How is this possible?