Ah Vayama
Had a less complicated problem with Vayama with schedule changes. Vayama claimed that their changes which resulted in a 30 minute connection in FRA were valid and that I would have to pay for anything that was reasonable. Original flights were fine with a 2 hour connection.
After some frustrating conversations with Vayama telephone agents I gave up with them. Phoned the airlines directly and they instantly made the necessary changes without any hassle.
Do not deal with Vayama. They are not on your side and will try to charge you for their mistakes. Very simply a profit motive - make unacceptable changes and then charge to fix them!