False advertising

Sky ****mer advertised a flight from Cape Town to Jakarta and Bali back to Cape Town via My Trip with 7 available seats at R18 000. 3 tickets was purchased 3 weeks ago and when wd wanted to buy the 4th ticket the advertised price remain the same but as soon as you click on pay afer putting your credit card details in, the price suddenly changed to R24 000. It remained that way for 2 weeks. Yesterday the price was updated to R22 000 but when I wanted to pay, it changed to R27 000. Their excuse- the airline changed the prices, which is understandable, but surely then the website must update after a day or two. I see this advertising as misrepresentation.