Currently if your subscription is canceled by you (by not paying, or credit card expiry. Extra gaming time is not given as they take payment before you can play for that month) your account goes into "Suspended" mode. Upon attempting to exit Suspended mode you have no choice to change your payment plan. You MUST resume your old plan or be unable to do anything. There is no ability to come onto the forums to contact support as when your account is suspended technical support from forums is suspended.
Please fix the ability to change payment plans without reactivating the account first.