KFC DISAPPOINTS me again

Around 12pm or so,my sister and I were VERY hungry and decided to stop at the nearest kfc before we head back home Randfontein. We order a streetwise 3, half liter sprite,4 dunked wings, wrap meal. On the way home,my sister decided to eat her food. Then we realise they forgot to give us the sprite. But it was too far to trun back,so we left it. Soon as we get home,I get ready to eat and I realise they gave me a STREETWISE 2. I was very very angry because I paid R37 for it and I got served less. Randfontein is too far to turn back all the way to Roodepoort and there was nothing I could do. My sister said they did not give her the reciept when she paid,so there was really nothing we could do. I'm very disappointed and I've lost my appitite. This is the 3rd time this happens but at different kfc,but I still keep going back!!!