Are you saying you booked and *flew* a C class flight to Japan in July and you had a Mileage Plus account which it was credited to, but now it's been nuked somehow?

Do you have the boarding pass stubs and ticket to prove the trip and the FF number your flight went to? If so, that should be proof enough and Mileage Plus should fix the problem, unless you'd done something naughty to have your account closed.

------------------
RichardMEL, UA 1K
A Star Alliance Member.