I'm not sure this helps but I missed a delivery the other day and previously RM would simply try again the next day as all collection depots were closed.
I received the red card and have been waiting for it be redelivered this week but only just noticed today that you need to go onlne and book the redelivery. I wouldn't have had a clue if I hadn't checked the card.
Doesn't explain your buyer's slience though.