Non cancelation of contract

Why when you want a contract, you can do it any day of the week. 365 days a year. But try to cancel, and it has to be via a telephone call, Monday to Friday. What about those that can't call during the week? They can't cancel at the store. They can't email, you have to call. Ridiculous! Please mtn, inform your potential customers that when they want to cancel, it'll be difficult as hell