Amazon Alexa subscribing you to Music Unlimited without you knowing

Just found out that I was paying for Music Unlimited $14.99 a month for the past two years. Speaking with a rep, I was told that if you (or your kid) asks Alexa for a song out of its free catalog, it will subscribe you without saying anything to Amazon Music Unlimited. Do yourself a favor and make sure you aren't subscribed unwillingly by searching "music unlimited" in your order page.