Not honoring promotion

I took a website screenshot of a promotion for a Samsung T7 1TB SSD for R1499 on their website a couple of weeks ago with an expiry of 31 Aug. Went to Craddlestone two weeks ago, no stock. They tell en Fourways has. Drive to Fourways who agreed to the price and happy to give it to me as advertised but again no stock. Found stock at Cresta and now they tell me "it doesn't show like this on their system", so basically to bad for me and the manager basically just smiles like I'm trying to cheat him. Worth saying that the website now reverted to normal price. No mention of limited stock, online only, or any other excuse that may apply on the screenshot. Also no denying from Fourways that the promotion is real and should apply. Frustrated that they are this disingenuous!