Getting kicked out of dinning food area

We bought a R70 chicken hot wings, we then decided to go buy juice at Checkers n rolls which cost us less than R20. We came back sat down to eat with our wings. As we about to eat store manger approached us saying we are not allowed to eat there cause we have some items which is not theirs, she also imp**** that it is their company rules. <br> <br> It was very much unfair cause we bought with a lot of amount there, but just because we couldn't buy drinks from them we got kicked from the dining area. I was going to understand if it was something from their competitors e.g (KFC) or we came with food from outside where we never bought anything from the store, it was just 4 Checkers roll n juice. I really couldn't understand their customer service cause the dominating food on our table was the store food.