The seller has informed me that they cannot deliver my item, and it has been a week since then. I have been requesting my refund, but I still have not received it. I need my refund.
Once the estimated delivery date has passed you can open an item not received case with ebay here,and escalate it after 3 days if you get no seller response or refund, See this link Get help with an item that hasn't arrived | eBay