I called Dahsing to follow up since I haven't received the promised response, and had them fax me the basis of their charges, please see attached (hope the attachment works and you can view it).
According to the lady I spoke with today, because the merchant registration shows Singapore vs Hong Kong, that is why they charge me the 1.75 %. I then asked her what happens if I charged from ie UAL, etc., she said there is no way to know where the merchant is registered until the charge goes through. I have informed her that these charges are bogus and intend to dispute it, she said she will refer me to a supervisor and will call me later. . HMMM, I've heard that one before.