IDK what you're trying to cancel but I feel that one law in California where services that allow you to sign up via the internet have to allow you cancel via the internet should be a nationwide law.
Or maybe simplify it a bit: whatever methods a service allows you to use to sign up, they have to allow you to use those same methods to cancel your service.
Or maybe simplify it a bit: whatever methods a service allows you to use to sign up, they have to allow you to use those same methods to cancel your service.