That’s why there needs to be regulation that requires companies to have a monitored email inbox for this type of request. It’s ridiculous that having only a physical mailing address and/or phone number is still legal and acceptable in the US.
Can’t be bothered to build a single-click cancellation button (which by the way is also a great regulation where it already exists)? Spend more time going through legally binding cancellations in your email and potentially retroactively refunding charges etc.
It should not be my problem if a website is clunky, does not work on my browser, is inaccessible from abroad (and I want to cancel now) etc. – email always works.