If you can't talk to the client you are toast.

The bad news: You are probably toast. The good news: You know this now, not on the ship date. Agile is not a magic wand, you still need engineering skill. However, Agile processes are designed to expose problems. It worked. Given lots of test effort and still shipping bugs it sounds like a competence problem. How to deal with that is up to you and your organization. Sorry I can't be more specific as I have not hit that particular problem.

Both the "Black Fly Song" and the "Log Drivers Waltz" were written by Wade Hemsworth. Wade sings the Black Fly with Kate and Anna McGarrigle singing backup. Kate and Anna sing the Log Drivers Waltz. Very fine singers and he is a wonderful songwriter.