Oh dear. Never thought Google'd be a company to shoot themselves in the foot. Listerine, now fights Google breath.
Furthermore, Google is not refunding the total cost of the videos. To take advantage of the credit Google is offering, you have to spend more money, and furthermore, you have to spend it with a merchant that supports Google Checkout. Meanwhile, the purchases you made are now worthless.
Yay Google!You can still keep the Google Checkout credit that you've received already. Think of it as an additional 'we're sorry we goofed' credit.