Being billed for Random things

So I was going through my online bill and see im being billed for "Entertainment services". I called customer care to query this and i was told its things that my account is subscribed for. I told them i dont subscribe to anything and then i was told and i quote "Sometimes if you opt-out of something, it auto subscribes you to it". *** is that all about. How long have i been billed for this?? You would think you can trust the service provider to only bill what you have approved.