Bad customer service experience

Re: [## 26665 ##] Re: A shipment from order YST633273 has been delivered

I purchased 6 items and only received 5 items. I queried it with them and I was told all items were sent. They didn't even care to refund me or check camera footage. The person I was communicating with on email didn't even care to give they name or contact number. I want my refund