Bad service & false advertising

I find this company very disappointing, in 2017 I complained about the horrible treatment from KFC in Kempton Park and I was promised that the matter will be escalated and the people involved will be dealt with and I will get feedback but upto now I didn't get feedback, I now got disappointed for the 2nd time with this company on the 30thSep 20 at 16:55, assisted by 38 Katekani ,they advertised that if you install their App and order you get an extra piece and that unfortunately never happened with me, I installed the app and try to order a Combo of 5pieces on the app and it failed, I kept on getting an error message and then I went straight to the store,stand on the long que,still tried to order online while on the que still the same problem occurred, I then approached a customer agent hoping that she will resolve my problem then I was told that their online is offline I must stand on the que and order like everyone else, I was upset because the reason I wanted to order online was to avoid the que,so I continue to order on the counter and sadly they told me if I order in store I don't get the extra piece even though I have ordered the 5pieces, I am really tired with this company's service it's pathetic. When will this company improve?