It is not worth the cost of the bandwidth to send messages citing cases to LO. Their people know those cases better than you and have made a decision based on the law as it applies to LO on these facts.
Either sue LO in Poland or Hungary or forget about it. You may seek assistance from a claims agency and expect to pay 25-40% of the claim. On the other hand, the claims agencies only take cases they believe they can win as they only get paid if they win. Thus, a good barometer.
The fact that a UK small claims court or its ADR program, CEDR, or Italian courts have different views will not likely make much difference in Poland or Hungary.