As the consumer should not bear any cost due to a faulty item this is the trader‘s responsibility. However if the trader is nearby (in the same city or area) and the consumer can deliver the product without much inconvenience he should do so. Even though it is the trader in cross-border purchases who should pay the shipping costs in connection with the complaint you cannot just send the goods for repair COD or by similar means. You must pay the shipping costs yourself first and then claim a refund from the trader. Therefore, it is important that you keep receipts of your expenses. If the seller denies the existence of a defect and therefore refuses to pay the shipping costs you must first prove that the product is defective. If the item is not faulty the consumer must bear the cost.