Is there any way to clear a ESN number for a Sprint ';Fusic'; cell phone?

Sprint won`t activate this phone unless it is cleared.Is there any way to clear a ESN number for a Sprint ';Fusic'; cell phone?
Whoever originally bought this Sprint Fuzic from the store reported it lost or stolen....which is the ONLY way an ESN can be bad. So whoever that person was, needs to call Sprint and have them take it off that list. If this can't happen (which means the phone IS really lost or stolen) Then the phone will NEVER be able to be reactivated....