Assuming your 30-day MoneyBack Guarantee with ebay is expired, you need to go to paypal and find the transaction within your Account tActivity. Open an Item Not Received case. Escalate. Don't accept an offer of a replacement in this case. Don't close the case until you have a refund.
Also, if you've ordered this from China, don't unless you've paid for tracked packet. Lettermail from China is experiencing months-long delays due to Customs processing as agents search for illegal drugs. (Google China mail and fentanyl.) It's best to order from sellers in North America until this crisis has passed.