According to law there must be intent to obtain something that you are not legally entitled to in order for extortion to exist. Many people here, Brian included, believe that the OP was entitled to some form of compensation.
Here is a quote from "The Legal Dictionary".
"Under the common law and many statutes, an intent to take money or property to which one is not lawfully entitled must exist at the time of the threat in order to establish extortion. Statutes may contain words such as "willful" or "purposeful" in order to indicate the intent element. When this is so, someone who mistakenly believes he or she is entitled to the money or property cannot be guilty of extortion. Some statutes, however, provide that any unauthorized taking of money by an officer constitutes extortion. Under these statutes, a person may be held strictly liable for the act, and an intent need not be proven to establish the crime.