Refunds when server is down more than 24 hours

This is likely because Razorgore was removed:

"What this means is that all of the Burning Crusade Classic realms listed above will be retired and will no longer be accessible after August 10. All player-characters remaining on these realms will be automatically moved to a new destination realm. We will post a full list of retiring realms and their destinations soon.

Please note: Player-characters that are automatically moved during the realm consolidation on August 10 may be unavailable for up to two weeks thereafter."

I don’t think there is a way to get your money back, that is covered in the Terms of service you agreed to before playing (they do not guarantee uninterrupted service)