Don't deposit any checks they

Don't deposit any checks they offered to you.
If you deposit anyone, you are enrolled according to the agreement.

Each time I received the checks, I just tear them, though unwillingly.

But one time I deposited one special check, and the same time I call them to cancel the enrollement since it promised in the agreement I could cancel ever I want the money. So I get that money, though only enable to enjoy 2 buffets.