Bad Customer Service

Today was my last day to buy from KFC Bellville. I bought chicken and requested for a thigh and two drumsticks, I was given two drumsticks with the center breast and it was not for the first time. I heard the cashier shouting the chicken choice but the packers did their own thing. Imagine it is my lunch time only got to see this at my desk and had to take it back because I will never eat what I do not want to eat. Why give customers the right to choose what they want and yet fail to meet the expectations. I doubt if I will ever buy from them and my colleagues are complaining about this behavior. Their till would only have one cashier at peak hours of lunch time, we que longer only to get a wrong order. I am very disappointed with the fact that it is not the first time.