Wrong order and poor service personnel not well trained to deal with complaints

I bought a full chicken with 4 sharing sides at Nandos Thornhill in Polokwane Limpopo province and got everything well cooked except the chicken. The meal was bought on 24 February 2018 around 16h40 I bought through their drive through and was told I might have to wait a couple of minutes as the chicken was still being browned. To my surprise, I got to the collection window and immediately got my order immediately. Little did I know that I was given chicken which was not well cooked. The chicken was still white and I returned it to the store. When I got there they just took the chicken back and gave me another chicken without showing any remorse or courtesy. To show that they didn't care, the replacement chicken was not as per my initial request that it have extra sauce and it was also not cooked properly. I had to settle for the extras instead as my health does not allow that I eat raw meat.