I feel guilty, but I did open a dispute. I don't feel I should need to do that in order to get a return communication. It's possible the transaction could have been completed without that action by me, the late return and no updates or return emails forced my hand.
Same what I did, or felt I need to do. It is just fair to expect for a seller to stick to n agreed date and to inform if there is a significant delay, or at least to reply to emails asking for an update after weeks of waiting.