tough call.... the 'support' people there should have looked at the original problem a bit more thoroughly.... permissions on a password file is not a needle in a haystack problem.
but,
you also have access to your server and any FTP program lets you view/change permissions at any time.
I'm sure CCBill will take care of you though, they are good people
*edit - just read you had this problem for a month? Jesus, who is your webmaster? Hard to sympathize with you babe.