I suspect when Audi have diagnosed and then rejected your goodwill request, the best course of action would be to search out (probably via Audi forums) a good and hopefully fairly local Audi specialists indy, who would probably be a good bet for future servicing too.
The problem will come when they want to strip the box down to diagnose the problem, you might find the maker unwilling to comment on your goodwill claim until it's stripped out, between a rock and hard place there.
Hopefully they'll do the right thing, let us know please.
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