Looks like they posted 2 days ago on Insta! Have you tried reaching out on there by any chance? :o
Edit: Also from 2 days ago on DA https://www.deviantart.com/marzghoul/art/YCH-97-open-25-1032364050 It's the same YCH from their Instagram post but with being this active on other socials I can only hope that maybe they're just forgetful about checking Toyhouse and not ghosting you TwT Also it looks like they've been accepting new comms since one of the ones from 2024 is from this month so I would implore you to send them a message on any other social media especially since your window for a refund is closed/close to closing :(
Edit 2: Just in case anyone else can't find it or doesn't wanna dig here is the Trello board where you can see they have comms due from February of 2023 yet in this year they've already taken on more without updating most of the 2023 ones https://trello.com/b/fMPQ2rfM/queue