Was a misunderstanding on both parts. I was (stupidly) replying via hotmail to a discogs email address rather than replying direct through discogs, as I always do. Only this time, matey's email address that the reply button linked to was long dead.
I've taken back what I said. Besides, I had paid for these tunes straight away. His feedback was rubbish, with a history of this sort of behaviour. But, as I've said, it's all sorted now so this is a non-issue now.