OK, so I've deleted the domain and re-register it again. Now its expiration date is 2013/2/xx. But I still can't signup using that domain. I just got an e-mail which says: Any ideas?
Well, I logged in to CO.CC and it looked like that everything's fine. I didn't find a link or something for me to renew that domain also (because it's already working?). Besides, the domain works when I pointed it to other DNS server, so I don't think it's CO.CC's problem.
Today when I tried to signup for a HelioHost account with the following domain: fancool.co.cc I just got an e-mail which says the domain already have a DNS entry, though I had pointed the domain to HelioHost's DNS server already. Any help is appreciated!