Complain--Unhappy Customer

I bought a juice today 23/08/19 Tropika 1ltr for R22. 59 at SuperSpar Soshanguve Crossing, I took a sip and it tasted very funny and when I checked the date only to find out it expired on 08/08/19, I took it back and I was assisted by Supervisor Connie, she asked me what I want and I replyed that I want my money back and a juice, she refunded me my money and told me I can buy another juice if I want, and when I told her this was not my fault that they display expired food and she said the juice does not belong to SuperSpar so it's not their problem and it is Boipelo's problem, I believe Boipelo is the merchandiser, I do not understand because I did not buy the juice from Boipelo I bought it at SuperSpar. I was very unhappy with the service I received today, I buy my grocery there at SuperSpar every single day but with today' s bad service I don't think I will be their customer anymore. I am very unhappy☹️☹️☹️