They should check their products when packing and selling it

There's nothing dissapointing as to buy a product and find out later that it has a defect. Bought a 24 brutal fruit case. Drove home and when I was about to pack it in fridge I discovered that some of the bottles where half full. Had to drive back to the store and explained my dissatisfaction to the guy at the door, his response was that he can exchange it for me. I then asked for the manager and I was assisted by an assistant manager. She could only say "I'm sorry" and her policy allows her to exchange the faulty product for me but she couldn't show me the policy. I've wasted my petrol and time for a problem that was not created by me.