False advertising

I was on the Sportmans Warehouse website on black Friday looking for some specials. I specifically wanted a Tennis sneaker, I came across one which was falsely advertised on sale. The normal price in stores and on the website was R1299. The website also advertised it on Sale for R1299 saying that theres a R600 discount, well there was no R600 discount!!! It was false. I contacted sportsmans warehouse by email letting them know of the advert, they responded saying that they have rectified the advert, however, they only have size 13 available. How convenient, when the process was falsely advertised, all sizes were available, immediately after they changed it there was only size 13 left.