其實這個叫unsolicited goods or services,可以查Consumer Protection Act。
GOOGLE 一下就能找到下麵的內容。
Unsolicited goods are those goods which are sent to someone without being asked those goods to be sent. Sending unsolicited goods in itself is not an offence. However, demanding payment for unsolicited goods is a criminal offence. Consumers can retain unsolicited goods or dispose them as they wish. They are under no obligation to keep them safe or to return them.