I've contacted Liqpay support, the transactions were never processed.
It's very strange, they charged my card successfully, but did not get an answer from my bank (?!) so the money was frozen, but they could not refund it because of an error and are doing it manually.

Does not seem very trustworthy, but I don't think it's 24change.com's fault. Hope to get back my money soon.
I will update then.