The Fantasy Westward Journey account should be protected to prevent others from using it for illegal activities. If the summoned beast equipment has been sold by him using your account, you can try to contact Fantasy Customer Service to provide relevant evidence and ask them to help you ban the player. However, since the player has already used your account, you may need to provide more evidence to prove his copyright. In addition, Dream Customer Service may need some time to deal with this matter to protect the security of the account. It is recommended to set the account password and other sensitive information as a complex password and change the password regularly to protect the account security. At the same time, you can also consider managing accounts with friends or other trusted people to prevent malicious operations.