Hi-Fi Corp changing their online pricing during the day yet valid till end of the week????

I saw an item for sale for a few days, a Samsung A11 for R2299 and it was valid till the end of the week. I saw the price around 11h00, by the time it was 15h00 and I was ready to purchase the price just changed without notice??? I called the call center and they are absolutely USELESS, CONFUSED and DON'T KNOW WHAT IS GOING ON. What a waste, I would rather buy the same product from elsewhere for a higher price than deal with your pathetic customer service.