In my case, I filed a complaint with Iceland air regulatory authority, even though
I lived in canada at a time, and when I told Icelandair I had done that, they suddenly became very proactive.
I generally go direct to the airline these days but if I get pushback beyond what I’m willing to deal with myself, I’ll use one of those services.
[1] Probably the majority of businesses does. But shady used car dealers etc. and Finnair don't.