Dear Sankar1991,
I regret for the experience you'd had with your international purchases. You can file 'Item not received' Dispute in Resolution Centre once you logged in your user account on eBay.com.
If you've already filed the cases. Kindly check for the time and date offered to the seller to respond on, post which you can escalate the issue to our Purchase protection team. Our team will communicate with you and the seller and help you to resolve your issue.