Requiring someone to call to cancel your service is almost always a shady business practice to make it difficult enough that it's not worth their time. If it takes you less than 5 minutes to sign up, it should take you less than 5 minutes to cancel. If you can sign up without talking to someone, you should be able to cancel without talking to someone.
That type of practice could use some sort of regulation.
There could be a rule where should be able to cancel with the same mechanism that signed up. If signed up and use the service with app or site, then should be able to cancel with them.
That type of practice could use some sort of regulation.