Hello

My girlfriend received tonight a message informing her that our return flight lh1337 from Budapest to Frankfurt (we should take Frankfurt to Nice after) is cancelled
I did the check-in earlier today with her info for her ticket and mine for mine but I received notice.

We tried calling +496986799799 but it either don't connect, or hangs up after a while, speaking German, and once it said to wait for English help, we stayed 30+ minutes waiting and nothing happened.

We don't know what to do and are super scared to be stuck in Budapest and have to pay extra for hotels v or find a solution to get back to Nice France by ourselves

What could we do ? Does anybody has a trick ? We don't even know why that flight is suddenly cancelled less than 24h before take off :'(