What's wrong with not buying a ticket and receiving a refund message? What happened?

Don't believe those refund messages. You'd better check them through customer service. A lot of information is fraudulent information. Don't be cheated. In addition, when some passengers purchase tickets through the third-party ticketing platform, they will be prompted that their personal information may be fraudulently used and they cannot successfully purchase tickets. Passengers are advised to log on to the 12306 website directly or use the 12306 mobile phone client to purchase tickets. It is best for passengers not to purchase tickets through third-party purchasing websites and mobile phone clients, so as to avoid being unable to refund or change tickets online because the purchasing party fraudulently uses other people's information, which will affect travel.