Once with the cell phone operator, I activated a service that was supposedly 35 reais a month, there when the credit card bill arrived it was 45 reais, when I looked they activated an insurance service and I don't remember what else, without knowing I began to search in the operator's app, and nothing there was nowhere to cancel that shit, I started searching on the web and nothing, there was nowhere, I searched on google and a youtube video came up, from someone who had gone through more or less the same thing, and I followed the step by step without a doubt I think I would never have found out how to cancel that if it weren't for that youtube video