Consultant "doesn't have time now"

I went to Mr Price Canal Walk to exchange an item of clothing. At first I was told that it's sold out and when I went to inquire stock at different stores, I was told that there was lots of stock in the back and it needs to be unpacked and checked. The consultant said that she didn't have time now, but took my details and said she'd call when she does have time to check, to let me know. I'm not sure what kind business you guys run, but this is unacceptable. Online, it shows that the Canal Walk store has 3 in stock. And now, due to the consultant not having time, I may miss the opportunity to make the purchase online due to stock availability. Surely this is not customer service?!