Misleading advertising

Went to Soviet in Forest Hill, Pretoria. There was a promotion/ special where it was advertised that get up to R150 off when you pair a t-shirt and shorts. I took a t-shirt and shorts and asked how much will be discounted by, and was told that what I took will be R100 less. I then asked to be given those items (pair of shorts and t-shirt) where I will get R150 off. I was then told that those are finished. I then asked why is the adverti*****t still up yet there's no items where you get a discount. When I raised the issue with the staff, one of the staff members dismissed me and said I have won, yet I was raising a principled issue. I went to buy the items based on a misleading advert in store.