I think Congress should pass a law that if you send a registered letter to the legal department of these e-commerce companies with your name, address and credit

I think Congress should pass a law that if you send a registered letter to the legal department of these e-commerce companies with your name, address and credit card number with an order to drop the service then they have to process it and cancel your "subscription". Companies would be required to print out the address of their legal department on the ordering page and sign-up page. Right now if you complain to your credit card company they won'thelp you and will refer you to the company which won't help you.