Flashsale - bought too many tickets

Hi, I bought a 3month interrail ticket on Saturday evening on my mobile. When booking I saw there’s both a youth and an adult ticket but thought it’s because of some system stuff so didn’t think much about it. Today I realised I basically spend an additional €340 because I didn’t click things correctly. Does anyone know if there’s any way of contacting Interrail directly to figure something out or no chance? :(