If you're looking specifically for a free and open source list of information, I regret to inform you that nothing of the kind exists: all data sources known to me are copyrighted and not free.
Source: I maintain OpenFlights.org, one of the internet's primary repositories of free flight data.
I'm assuming both flights are on the same ticket. (If they were not, you're out of luck, and in fact you were lucky to be rebooked on a later flight at all).
You're barking up a slightly wrong tree by going to the Swiss national enforcement body. Since both the airline and your point of departure are Polish, it would more relevant for the Polish enforcement ...