Very poor customer service

I just got very bad treatment from the Manager of Cambridge foods in Durban Market, near clermont rank. I bought a yoghurt in the morning going to work , when I got to work I opened it and found that it is expired. I kept to return it after work, when I got to cambridge the manager rudely told me it is not his problem, he said if I like I can take my complaint further. Very disappointed with Cambridge foods, will never buy there ever again.