Same thing happened with me, and also to a friend of mine, who only got her notice today as she has been away. We're not stupid, but I am wondering what we did wrong. I tried to log on as soon as I got the letter, but kept getting the message telling me either my property number or password were wrong. So I rang - the guy was dead nice and told me to log on and make the change myself.....when I explained that I just got the error, he tried with the details from the letter but he couldn't log in either. He transferred me to Ennis, where a really nice woman changed the payment for me from monthly to single payment......she reckoned my log in details were OK! I think I'll let the dust settle before I try to sort out the log in problem. Really annoying, especially as the letters came so close to the date of the first payment.