A. 1. If you are denied assistance with a refund, gather all relevant transaction details, including dates, amounts, and any correspondence with the seller. 2. Go to the 'Resolution Center' and file a dispute for the transaction. Provide all supporting documentation to strengthen your case. 3. Follow up on the dispute regularly to ensure it is being processed.

B. 1. If the seller is unresponsive, consider escalating the issue by filing a claim through PayPal. This can sometimes prompt the seller to respond more quickly.