Missing items and Shein don't want to take responsibility for it

Firstly my order's delivery address was changed in JHB that I did not request or approve. The package delivery was delayed for 6 days (from 11 Oct until 16 Oct) when I received the package. When I received the package, 3 x items was not delivered. I paid for the full order. When I queried this 17 Oct, I got an response on 22 Oct saying "After verification, your package has not been missing any items. We recommend that you check your package again carefully." How can I miss 2 x dresses and a pair of tekkies in the package? I ask you. I am trying to get hold of someone to talk to, without any joy. I have already placed my next order unfortunately and really hope I don't have the same experience. My orders are normally >R2,500 - I support them a lot. I truly hope they can treat customers fairly.