I can assure you expiry dates on credit cards are joke.
Let me put it this way, a friend of mine once running a business and dealing a lot with credit card numbers over the phone, customers would quite frequently give the wrong expiry date meaning payment would not be honoured, so basically we would just try a different date and most of the time it would work, now unless you are trying to say that the made-up date just happened to be the correct one, well that is always a possibility but this happened on hundreds of occasions, not just once or twice.