Bad customer service

Yesterday my family and I went to the nandos to purchase lunch, using the drive thru, when we got to cashier I ordered the "you people meal" the lady seemed as though she had no idea which meal that is (I got confirmation that she had no idea what the meal is because she only ringed up a single full chicken with 4 sharing sides instead). I asked Gertrude for garlic rolls as one of the sides, Gertrude then told me that they were not serving garlic rolls, she did not provide me with a reason that made sense as to why the garlic rolls were not served. Gertrude seemed like she was drunk or perhaps she was not feeling well as her service was very poor and she really seemed disinterested in serving clients. Getrude does not seem to be someone who respects her job and her clients or perhaps she needs customer service training because she could not even state the sides that were available, she did not seem to remember. After this whole struggle to place an order with Getrude when we arrived at collection, the lady told me that I should rather go because the queue is out of control, there's nothing she can do with Gertrude not getting the order correct, a nandos employee telling a patron to go and buy food somewhere else?? I'm very disappointed in this service.