Poor service caused death

On the 29th of August 2015 around 13:48pm, I went to Nandos and specifically ordered two full chickens with lemon and herb sauce. I requested them to be cut in 8 as well as for them to have extra sauce of lemon and herb so that the chicken would not be dry. I strictly had ordered a lemon and herb sauce because my uncle is allergic to chilly. The cashier did not repeat my order and just told me how much it costs. The slip showed extra sauce of Mild and i queried this with the female manager on duty and she responded to me as if I was asking if i would be charged for extra sauce. I have been buying Nandos ten years, i am very much aware that i do not pay for extra sauce. We got home only to find that the first full chicken had Mild, my uncle only realized this when eating it. He started getting ill from that day, until he was admitted to ICU and he has passed away. All because someone failed to just sincerely repeat the order and make sure that I got what I asked for. I never thought that Nandos treats customers with such disregard, am heart broken.