Inflexible staff and menu

I went into the Woodmead Fishaways yesterday afternoon and ordered a platter for 1 with chips and salad. The lady serving me (Sthandekile Maphosa) informed me that I cannot have chips and salad with my platter. Rice is the standard starch and then I can pick either chips or salad to go with the rice. I told her that I did not want rice , but wanted chips with salad, she said she cannot put through that order and she stopped the lady who had started preparing the 1st part of my order. When I asked why I could not have what I wanted to eat, she told me that the menu was done at headquarters and they could not change it. I asked for the headquarters number as I wanted to ask why I cannot order my preferred combination. She told me that she does not have the HQ number (really!!??) but I can Google it. which I did ( ********** 587) and called. I spoke to a lady called Thandi and she said she would forward my query as to why I cannot order what I want. My question to her was who at Fishaways HQ has decided that the standard for platters must be rice and made chips and salad the added items. Who eats rice with chips anyway? I have been assigned a reference number (388733) and am really not sure what for as my question is simple. Why can I not order and pay for what I want to eat? Why is the menu so inflexible that I am forced to eat rice when ordering a platter? Why can the menu not be chips or rice and salad? Its all the same price. Is this really an HQ directive or staff at outlets have decided not to assist customers?