If you did not receive the tickets as your seller never mailed them to you, please raise an issue against this purchase in your PayPal account ASAP. They are our transaction partner and we arrange for the reversal of payments through them. Outline exactly what has happened and they will investigate the seller with a view to refunding you.
If you are having issues with the PayPal dispute, please contact our support team with your PayPal case ID and we will assist PayPal in the process so that it is resolved as quickly as possible.