Why am i not getting any credits on halo reach?

i used to have xbox live, and eventually became a warrant officer grade 3, about 10000 credits from captain, but then i moved and couldnt get xbox live anymore. at first, i would get 60 credits for EVERYTHiNG, whether it be a 5 hour firefight or a 5 minute campaign session, but now a message will appear saying "offline credit limit reached" and no matter what, i'll get 0 credits. whats up? is bungie screwing offline players?