Have you tried to reset the controller or reconnect it to the system? There is a red button on the Wii console if you lift that little pannel and there is also a button under the battery cover. Push them both to reconnect it. Maybe that will work
go to a shop buy a preowned one, then take urs back and pass it off as the pre owned one, and say you want a refund and will buy a new one when you get more money. sorted!