I am a terrible bookkeeper and have been known to send another payment. I have one subscription that goes until 2019 before it expires. Another way the subscription is taken by another magazine when one stops publishing. Many are published by the same company and when one goes out of publication they add the remaining months onto another similar magazine. My daughter bought some subscriptions probably from a school fund raiser, and is still getting the magazines 5-6 years later (no bills though) She has called and tried to stop them, but no luck. One is for parents of small children and my DGD is almost college bound. Strange.
Sue