Service - disrespectful

I quite enjoy going to the different branches of copper club, however my recent experience at Tygerwaterfront was not pleasant at all. A couple of my mates and I were having drinks and one of them decided to get the burger special- 50% off. I can't remember the waiters name, however when he placed the burger in front of my friend, I grabbed a fry as one does. As I did this he rudely stated that we are not allowed to share the special and threatened to charge us the actual price. I felt incredibly attacked and humiliated as this was not my intention. just thought it was necessary that it should be brought to the attention of the manager as it really was not polite way of treating customers.