Sale price changed

Good morning yesterday the 30th of July 2018 i went to Buco hardware in Giyani i found that there was a special for Aluminium windows 1500x1200 for R1099.00 and other sizes but i wanted the 1500x1200 x2 and 1200x900 x1 for R932.36.00 . So today the 31st of July 2018 i went again to buy those windows and i was told the 1500x1200 window size the price has gone up meanwhile there was still a price of the special on the windows and the other one was still on special, was so disappointed because they refused to give me the special price which i saw today .

Just imagine having prepared a certain amount of money to buy a thing and only find out that the price you saw is changed