What are your best tips for making sure a subscription is fully canceled and you don't get charged again unintentionally? I recently canceled a service that I thought was done on my mobile device, but then a few weeks later, I got a charge on my bank statement. It turned out I had to cancel it separately through a different portal because of how I originally signed up. This kind of experience is really frustrating, so I'm looking for foolproof ways to verify a full cancellation.