I'm super sorry for the inconvenience and for the limited lead time. Unfortunately, this change wasn’t fully within our control and was required by our card partners.
You tried to sugarcoat this - to pretend like forcing customers to change dozens of cards in December was exciting - and in the process, lost all trust. You could have simply described the problem honestly and transparently.
There needs to be more transparency about how your partners forced you to this course of action and on this timeline, because this is going to seriously hurt your reputation and business. That sounds like an abusive partner, who doesn’t care about you. Or they make for a convenient scapegoat.
You tried to sugarcoat this - to pretend like forcing customers to change dozens of cards in December was exciting - and in the process, lost all trust. You could have simply described the problem honestly and transparently.