putting the issue with the terms and the card being deleted aside.
i have to agree that you can't accuse them of scamming you if you got the card for free and never used any of your own money on the service.
You can give me a gift and then you can take that gift from my room when I am away from the room?? When you have given me anything all the rights reserved upon me no one else even you have no right of that gift what to do with that gift and what to not. If you can do that then that will be nothing but an eye-wash or passing something to scam more. And if that is the case then they are trying to scam money by it.