I get so annoyed that stuff that like continues to be tolerated. If more people complained and made a point of not sweeping it under the rug, then things will start to change.

Write a letter to the editor of the the newspapers here, and send one to the head office of Qatar Airways.

Where did your flight originate? Other countries often have differing rules on passenger behavior and safety procedures. Notify them/pull them into this conversation and issue to bring more attention to the event and the complete lack of any response once you landed.

I have to say, yours is not the first story I have heard recently that makes QA look bad. If enough stuff keeps happening to damage their image, they will care enough to start changing things.

"Most plain girls are virtuous because of the scarcity of opportunity to be otherwise."
-- Maya Angelou