Selling Expiry food

I'm so disappointed with Sea Point Spar i sent our maintenance guy to buy me Amahewu so when i drank them they were off so i decided to check the date and they were already expired they didn't wanna take them back until i asked them to view their cameras. They told our maintenance guy that he was suppose to check the date first before purchasing....thats not his job i am so irritated and annoyed on how the matter was handled