Mango Airlines website raises my stress levels

There have been many instances of when I was trying to book a flight on the Mango website, i would get to the payment confirmation step and the flight i was trying to buy is no longer available. Now i would understand this when Mango is holding a sale but surprisingly i have always been successful with sales purchases. On any other day, i would have to try 4 or 5 times to book a flight as the system always gives an error at the payment step. When the help desk is contacted, they would tell you that the system info in constantly changing. Why dont you update at specific times instead of all day long!!!