Thank you for the response - I wound up posting a "complaint" on the Asiana website, which was responded to today. It's actually very good response time. They waived the no-show fee, and appear that they will only charge the understandable refund fee.

I also was able to finally get through to the US 800 number. I called 8 times with the same "We're busy" response & hang-up, but then got through this afternoon. So perhaps recommend trying in the early afternoon if anyone else finds themselves in the same position. Thanks.