Thank you for all your valuable responses. I'm not a frequent flyer, but certainly you guys helped. I'm going to write a letter to them and use some photos my trip report as proof.

To the poster above somewhere: It's not free upgrade, it's miles upgrade. Nad I'm not those people nick picking about everything. That's why it took a month until my friend told me to compensate. If I didn't tell him about my trip, I wouldn't even bother. Which is also why the FA did not file a report...because I didn't want to bother anymore after 3 attempts. I hate being annoyed...