Wow, could you have put more incorrect statements into one comment?
It is a problem with their website if they are losing orders. The customer may not always be right, but losing an order through a technical problem is always wrong.
Credit cards do frequently have four digit years, and if the site asks for "year" it is perfectly reasonable to put in four digits.
Autofill programs may fail, but it is the dev's problem since that's the platform they're working on. And it's a perfectly testable scenario, so no excuses it's just poor coding.
If you've ever looked at any research on loss of capture through UX issues you would know that the percentages lost can be staggering, even at payment stage. You do not want to give people time to get pissed off, think about if they really want it, or look at the total price again.
Biting the hand that feeds IT
