KFC Braamfontein is force selling upsize meals

I have been going to kFC Braamfontein for more than 3times now since I only started working this side from March.Its very strange how they don't want to sell us the R50 Meal box meal they insist we have to upsize and I thought that it's only a customers choice but at KFC Braamfontein they insist that u must by upsize our bugdets for lunches are not the same please can we be treated fairly I had this experience more than 3times stop taking people for granted in every business every cent counts