Unhappy customer

I'm so deeply disappointed in Shein. I have informed them of three items not received on my order placed on 27 April. But they want me to pay.???? I have paid a huge amount for this order. But they refuse to refund. Or resend items not received. Or place credit on my Shein account. It doesn't matter what option I choose. They want me to pay.... They made the mistake and not include the items... So why much the customer suffer under there incompetence. They should be Boycott. I agree. I will NEVER RECOMMEND THEM FOR ANYTHING OR BUY FROM THEM AGAIN