Have you tried to charge it back and the bank refused or you just haven't been able to initiate a charge back online? I was recently able to charge back an air ticket on an Ecuadorean flight, although I had to contact Chase and have them do it manually as it was no longer possible to do it online.
I have been waiting for my refund of fees and taxes from AC on an award ticket since May 4, so I may have to test this process with Chase again.