In this case, you need to contact the seller to confirm if the tracking number is right. The seller may give you a tracking number of another customer. If the number is right, he may filled the address by mistake. If all are right, there is a chance that the courier sent it to a wrong address by mistake. You need to contact the courier who delivered it in your country to reflect the problem and check it for you as soon as possible. If the package couldn't be found at last. You have the right to ask for refund or require to send one again to you from the seller.
In this case, you need to contact the seller to confirm if the tracking number is right. The seller may give you a tracking number of another customer. If the number is right, he may filled the address by mistake. If all are right, there is a chance that the courier sent it to a wrong address by mistake. You need to contact the courier who delivered it in your country to reflect the problem and check it for you as soon as possible. If the package couldn't be found at last. You have the right to ask for refund or require to send one again to you from the seller.