Purplle.com — Order not delivered delivery date kept postponed

It's almost 20 days by now. I 've prefer my product worth 860 from purplle. They are not delivering my product. When i track shipment they kept postponed order dilivery date everyday when i check my order status. I don't know how long they would keep changing. If you are going to dilivered then diliver soon i can't wait any longer or cancelled my order i would purchase from other online store.