Only a fool would go get a lawyer instead of making a phone call. Especially, if you have employees who you can tell to make the phone call too. I suspect if you did get a lawyer the first thing they'll suggest is they call the number to get it cancelled and will ask if you called the number.
I'm not talking about a customer getting a lawyer involved. I'm talking about a DA looking into whether Baremetrics is violating CA law by not having an online-only cancellation option to corresponding with its online-only registration system.