Originally Posted by Often1

I would think that you definitely want this to be an email contact so that you can provide PDF copies of the relevant documents, including the receipt and your CC statement showing the charge posting.

Your mention of the forex fee suggests to me that the agent at HKG quite naturally posted the charge in HKD and that when AA went looking for US$350.00, there is no such collection under your PNR. Rather, there is a collection somewhere for approx HKD 2,715 and the corporate security folks have not drawn the connection.