My Lovely Mac

Laptop had a defective screen with a large blueish shape covering around 25% of the screen. In this 25% the screen could not show white, only light blue. I showed the discoloration at an Apple store and Apple store staff said absolutely out of spec and covered by warranty if there's no water damage.
Shipped back to seller. Seller claimed to send the money back, but no refund ever showed on paypal. I had to open a paypal claim to get a refund. Seller messaged me that if I closed the claim on paypal, the refund would come through. In reality, if a buyer closes a dispute claim on paypal, the buyer forever gives up the refund.
Over several calls to paypal, paypal staff told me that seller was not responding to paypal's requests to confirm that seller had received the item back. It took weeks after seller received the item back to receive a refund. Seller required that I pay return shipping and did not reimburse the cost of return shipping even though the item was not as described.