I had registered a domain with yahoo before.. now after a year i transferred it to godaddy about 60 days before it. And I am still getting payment due reminders. I think yahoo is not paying much attention to its domains department... this is the 4th email I got from them.
That's just the way they do business. Somewhere in their site are instructions "requiring" you to cancel your account with them. Makes you glad you moved away, eh?