First of all, it can be defined that the piano has defects, the panel is sunken, and the tension of the neck is cracked, which will affect the timbre. That really refers to the workmanship on the board. Buyers often can't check the piano on the spot and find it damaged when they come back. The merchant will respond why you didn't inspect the goods at that time, and it is the responsibility of the courier to refuse the visa. It is your responsibility to sign. Generally, you can send it back by sending more postage at most, and it is difficult for him to give you all the round-trip freight. So you should at least exchange it with him, or return it to the video store. Most people who can play the piano like to go to the music store to choose what they are satisfied with, and it is more expensive than online shopping. Do you think about the same batch of goods, will you sell the best quality or the poor quality in the store?