Originally Posted by
Klaudia Snopek
....they said that they have high-volume of complaints and not much they can do for now?
That comment both reflects he airline's standing, and encapsulate its approach to customer service
The BA forum has an excellent thread on claiming compensation under EC261, much of it relevant to claims in general rather than simple BA. There are a number of routes towards mediation and settlement described.
The 2019 BA compensation thread: Your guide to Regulation EC261/2004
you could contact directly the body enforcing the legislation, but don't hold your breath:
https://ec.europa.eu/transport/sites...ent_bodies.pdf
And you could, of course, contact one of the agencies tha deal with this in return for a (quite hefty) cut of any compensation money you receive.