Unhelpful Tygervalley Woolies

Woolworths Tygervalley only have the top piece of a two piece sleepwear in medium on their shelf but they are unwilling to swap that item for the top piece of the large outfit, or even sell it to me even though they can't find the bottom piece and no one else has stock of the medium outfit to swap both pieces. I was told they will just be discarding it. Not accommodating and quite wasteful.