Refused participation in promotion

My sister and I went to purchase my brides**** dress yesterday, whilst the fortune cookie promotion was on. We first went to Clearwater Mall, where Thembi was incredibly helpful. They didn't have the dress in the correct size, so Thembi phoned the Rivonia branch and they put a dress aside for us there. Before leaving Clearwater it was confirmed that the fortune cookie promo would apply. When we got to Rivonia, half an hour before closing time, we were firstly told very nastily that we were late (even though we hadn't arranged a time). We then had to wait over 20 minutes and ask numerous times for the dress to be brought through, and then were refused participation in the fortune cookie promo. Nowhere on any of your promotional posts or the online Ts&Cs does it say brides**** dresses are excluded, and Clearwater had confirmed that they were included. We insist on being refunded 50% of the purchase price, as this is the maximum discount we could've received. Furthermore, I suggest you speak to your staff about their shocking attitude (and thank Thembi for her great attitude).