KFC deceiving the public

The R2 Streetwise 2 deal on the KFC app is false advertising. On Thursday 27 November, I was logged into the app by 13H00 when the deal loaded, when all of a sudden the app went blank and reloaded. After the reloading, this R2 deal was no longer available. On Friday 28 November, this deal was loaded for 11H00, I logged into the KFC app and I managed to get a R2 Streetwise 2 deal. I added it to my cart. However, this time around the app refused me to go to the checkout to pay. Message on app says that I have not met the deal conditions. I called the KFC call centre on Tuesday 2 December after not getting any feedback on my emails. Now they say that it is a technical issue that caused this problem. This is unacceptable