He was not satisfied with the products he received. The seller gave him a partial refund plan. He seems not quite satisfied with the plan. So the seller is willing to bear the freight cost of the returned product and let him return the product for a full refund. He agreed. After that, he refused to return the product. At the same time, he repeatedly asked the seller to give him a refund. The seller insisted that he return the product to get a refund. Perhaps because he found that the seller was very stubborn, he could not take advantage of the seller, so he said he agreed to a partial refund. He got a partial refund but left a bad comment.
Please remember that you may get his bad reviews anyway. The recommended method is not to sell him anything.