Complaint regarding new account

I app**** to open an Edgars account, on 16 August 2018 it has been approved. I still went to fetch my Thank U card the same day. I also joined the VIP club in order to take part in the promotion that if you spend R1800 you get R900 discount. I went to Edgars Tygervalley where I wanted to do my purchase. I enquired the till operator and asked her if I spend R1800 would I get the R900 discount as I just opened my account and are now part of the VIP club. So she said “yes”. I started browsing and took an Adidas hoodie which I wanted to buy. The till operator came to me and saw that the hoodie was on special and said that those items with the RED STICKER aren’t part of the promotion because it is already on sale. I told her that nobody told me that allthough I put the hoodie back and carried on shopping. In the end I chose a pair of Adidas takkies, Adidas hoodie and a Puma pair of socks. I went to the same till operator to put this three items on my account. As the lady scanned the Adidas takkies she said that those pair of shoes is already on sale and that won’t qualify for the special offer to get R900 discount. The Adidas takkies did NOT had a RED STICKER on it, neither any of the other pairs of the same shoe on the shelf indicating it is on sale. I also offered to pay the normal price of the Adidas takkies so I could get the discount with the rest of the items I purchased. The till operator said I can’t do that. In my opinion this is false advertising and unclear because it wasen’t indicated anywhere where the special offer was shown. If this matter doesn’t get revolved I will take further action.