Very dissapointed customer

My best friend and also bride to be found beautiful brides**** dresses at Forever New. As brides**** I wanted to exchange one of the dresses for another size and saw another beautiful dress that we liked more. And luckily the dress was on 30% sale as it was more expensive than the other dress. I sent a picture to the bride and she fell in love with it. The store assistant even kept two dresses for us while I consulted with the bride. Just as I was about to pay for the two dresses, return slips filled in and everything, the store assistant rang up the dresses and to our disappointment is wasn't on sale (although two dresses had a 30% off hanger). The store assistant phoned her manager which informed as that only if 3 dresses had sale hangers, then could we get the dresses on sale. The bride isn't able to afford the full price so I had to return both dresses. We are now so disappointed that we decided to also return the original dresses because of the incident. I am a regular shopper at Forever New but I am so put off now that it will be difficult to go back. I even still have the picture with the dress that shows it is marked down at 30%.