The fresh realms are supposed to keep their “fresh” tag (and therefore no boosts etc) for 90 days.
I am too lazy to count, but a rough estimation is that at least november it is still locked
(announcement was end of august : New Fresh Start Realms Available with Pre-expansion Patch - WoW Classic / Wrath of the Lich King Classic Discussion - World of Warcraft Forums (blizzard.com) )
And in this thread the restrictions were mentioned, with an additional blue post that they intent to keep it locked for “at least” 90 days)
The question regarding a refund is a question for the CS team. 