Manager refused to sell me item which I acknowledged the defect

I found an item which was incorrectly priced at the store (lower than the actual price). Upon inspection of the garmet I noted that it was slight defective but still willing to purchase it. The Manager at Zara Menlyn refused to see it to me saying that it is against company policy. I got assistance from the Zara Online chat and they confirmed that as a customer if I accept that the garmet is defective, the store should allow me to purchase the item. I willingly told the Manager at Menlyn that I still want to purchase the item and she refused. I then asked her what would happen if the garmet was purchased without acknowledgement of the defect and she kept referring to ‘it’s against company policy’ and couldn’t give me a straight answer.