Last year I subscribed for a one week plan only. I now want to watch some past matches of AFL. I changed my credit card details when trying resubscribe, and still could not watch a program. I used the unsubscribe option and then tried to subscribe again. That did not work. My account has the word Grace in as a some form of status against it.
Besides the fact that there is no one week plan (It is a recurring weekly subscription until you unsubscribe), when you unsubscribe, you can't resubscribe until the current billing period is over. You may need to wait for a week before you can resubscribe.
Never be afraid to back yourself when trying new things, just always make sure you have 3 escape routes if things go wrong.