Worst customer service ever

I went to game in tygervalley about 2 weeks ago. They had a special on their Aquella flavour water 5 bottles for R30 so when I got to the cashier it didn't scan the special so I asked the cashier about it he called the supervisior and told her she went to check and said there is no such special she was so so rude so I went to take the huge special price sticker that you can't miss of the shelf and so it to her she just ripped it out of my hand and walked away.