Zivame — Half of what I ordered only delivered, but total money I paid

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I m syamala from hyderabad, I ordered 4 items worth 1000 they delivered only 2 items worth 500, but I paid total money of 1000. I need refund or other 2 items delivered immediately. They don't even have customer care or complaint or queries part on their website or app. Please resolve my problem soon.