Shoprite - Am complaining about a cake i bought today

I bought a cake at Bloemfontein middestad today when I get home I cut the cake to my family my 2 sons ate the cake the younger 1 complained about his stomach,I didn’t notice until he started vomiting my older my niece came and show me the cake is rotten and smelling I told her I bought the cake at Shoprite it can’t be, I had to cut and check my self only to find green things that shows that the cake is smelling,I want my money and I want Shoprite to know if something happened to my child I will blame the for everything if they do check their expired goods non of this will happen.