Exact - Incorrect pricing

I wanted to buy two ladies t-shirts priced at R99 each and also labeled buy 2 & Save.Iasked around at the shop as I wanted to find out how much does one save when taking both t-shirts.Two ladies(without name tags) told me I will pay the price I see on the tag and they carried on with their conversation.This is exact stores in East London Oxford Street.

I ended up paying the full amount for the t-shirts .I was so disgusted but wanted the t-shirts hence I ended up buying them