Ripping customers off

I'm still writing this to emphasize that mango is really ripping clients off with the 40min check in. I tried checking in 30min before my boarding but their system declined me as I was late, how is that my problem if the system does not work. After making the 2nd booking the flight was delayed for 25min yet no one came to apologize to us and explain the delay I was later for 20min and I get penalized for it even get asked to book a different flight clear it only about their business making money and not keeping the client happy. This is my 2nd email I'm sending but not even a single response/communication from them. Evident enough to show clients opinion doesn't matter.