Item out of stock and nothing can be done

On the 07/07/2015 I went to the Identity store in Four ways crossing, I was looking for a dress and they did not have it in stock I had a picture of the dress and I showed it to the store assistant her name is Bongi who was very helpful and she went an extra mile and called few branches to check if they had the dress and she found it at one of the branches but it was a small size so Bongi requested the style number from the other branch and it was given to her so she placed an order for me and said I should get if after 2 weeks and she asked me where it should be delivered and I choose a store that is closer to my place, today I got an sms from Identity that the dress is out of stock and the order was cancelled so I called the head office in Cape town and the lady that I spoke to confirmed that the dress is out of stock and there's nothing they can do. I am very disappointed because I was hoping they will get me the dress I mean I am their customer I have an account with them. they should make sure that they keep their customers happy at all times. from this experience I am considering closing my account