Lack of customer service

I'm so disappointed with the service I got from an agent over the phone. On the 29th of November I bought pots online as a gift to someone and they were delivered at my work address and I did not open the box as even when I buy pots physically in a store I don't open the box. Now they pots were opened yesterday and there's 2 pots and 3 lids missing and when I called customer care the agent that I spoke to said it's my fault that I did not open the box when it was delivered so pick n pay won't take responsibility as I was supposed to open it before but even when I buy in store I never open boxes until I'm ready to use.