Check out the Florida laws regarding a "mechanics lien". I believe once placed on an aircraft the aircraft may not be moved until the lien is cleared. The downside is that it may be challenged, if the courts agree with the challenge, your screwed. Often the threat of the loss of revenue is enough to get things resolved.
Many of he Florida locals tend to treat us as dumb foreigners, get tough but stay legal. Is there a Scotsman involved with the same initials as a well known motorcycle ? if so just call the cops.
Good Luck