Most people don't look at their bank statement often. For those that do, they sometimes overlook things. I think the most common reason for cancelling through Truebill, though, is not wanting to waste time dealing with cancelling the service.
The point is, you shouldn't HAVE to look at your bank statement to find this stuff. We do it for you, and we keep an eye on things for you. If you want to make sure you're not charged again, just set an alert. No need to check your bank statement.. just wait for an email from us.