Streetwise 2 complaint at kfc pretorius street

I have been going there to get streetwise 2 on three occasions and im told that it is “compulsory” that i buy it with their bun and i told them i dont want the bun because also the price increases and im told i cannot purchase it. The first time i went i agreed and said they can put the bun in but when i got home the bun is nowhere to be found. I am very unhappy with this service as a customEr why are they choosing what i should eat and what i should not eat