Is the civil aviation online network reliable?

I booked a plane ticket in Qunar.com a long time ago. Later, I needed to buy one for the same flight, so I made a phone call directly on the website and found out the relevant information of the previous plane ticket, so I bought another one, but I didn't receive the short message of successful booking on my mobile phone. I was very nervous at that time, because it was my first time to book a plane ticket, and I was afraid of being cheated. Later, I made two or three consecutive phone calls and finally received a short message (the address left was CAAC Online). Today, I still feel uneasy, so I went to official website of China Southern Airlines to check. As a result, I was relieved that the ticket was issued normally.

Finally, it is more reassuring to book tickets on ordinary websites. I want to know why everyone upstairs is a liar. Solve!