I have a VOIP account. It was an auto charge. One day my credit card expired. They sent me a notice that my account will be canceled if I did not change my account details in their website. I did not want the service anymore so I tried calling them. They were not answering my calls. So I left them assuming they will not charge me anymore as they do not have my new expiration date. Suddenly after 5 months they some how updated my information in their website with my new expiration. Even I did not know my credit card new expiration date as I was not using that card anymore. Then they have charged me for the past 5 months where my account was suspended. They argue that I changed the account details on their webpage which I did not do as I even forgot the login details of their website. How can this happen?