Are you being careful with watching the balance and charges on your credit cards? For some reason, every Christmas, Master Card seems to change their due date. I have the same due date every month all year long but it changes to an earlier date at Christmas. I always pay the full amount. I knew I had a bill to pay so I was looking at the charges making sure they were right and just like before - there was an interest charge from the month before. I had made my payment two days early. Now I will have to wait and see what happens. I wrote to them telling them that I do not owe them the interest. I have done this before and while they did not contact me, they did remove the charge. I'll have to hope they do the same this time or I'll have to find a way to go further. It isn't a lot of money but consider how much they make if they do that to all their customers.