Samsung — Product not received, but saying delivered

I ordered for a mobile from Samsung's online shop on. It was showing out for delivery yesterday. Then suddenly I got a message from Samsung saying I have requested to cancel the order. When I contacted them, they said I have declined to accept the item etc. In fact, no delivery agent called me neither anyone came to my place to deliver it. They took my complaint. Now I got messages saying the product has been DELIVERED. My order id is [protected]. I have never received the product. No body from the courier company has contacted me.