Airfare delay compensation failed

Sometime ago, my flight to London got delayed for 4 hours in Doha. People around me were quite pissed, however I was sooo tired that I couldn't care less.

However at some point one of the passengers handed over me a card and told that we can claim compensation for all this mess. Idea about free cash energized me, and I've put it in my todo.

Today was time to execute on this todo. At first I've compared few Airfare delay compensation claim website:

They all seems to take a lot of money for their service, probably going directly shouldn't be too much of hustle.

Then, I'm like okay, let's try the most popular one: Airhelp.com. After filling all the details, I got sad news: "No money for you honey" :( Without any reasoning.

Another website gave me a bit more information:

Sad and no luck, I wrote an email to Qatar Airways directly, hoping for their good will :)

This story has no happy ending or morale, just a note for future me.