Abusive Supervisor

Today on the 23rd August 2018 at 3pm, I went to Nando's in Musgrave for a lunch with my son. We were served a cold chicken which was iced melting, we then call the supervisor for a complaint she said there was nothing she can do because we have already had a chicken of which we had a little almost a half of it, I then ask for a manager or owner, she said she's not around but she will come she took a photo of the meal that we're complaining about and she waited for some time and came back to us and the manager said he'll not help us. When she took a photo of a meal she called it "bones" I then said to her if it bones I am asking for a refund because we haven't had even much of it and it is cold and tasteless. She left us in the table and never came back, I waited about an hour and decided to go to the counter where she was and asked her name she said her name is Percy rudely also her surname she didn't give me she said everyone knows her by that name and if I want to complain I must call the Customer Care then she took her bag and left the shop. She was so rude and discriminating because she called my meat bones repeatedly which provoked me to the point where I wanted a refund! To me I felt like I was in one of those Township ****as where the staff is not trained for a customer service. We left the shop very hungry and sad. We never enjoyed even the little we had!