Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Mailed in One-time Payment by Check
I do know that a blank check has all the information they need for the electronic transfer. They probably add it as a customer service to streamline future payments. Though I don't think automatically adding it makes good business sense. It is possible that the form used to submit the check included a line to added the account to the list of authorized accounts.  He might have been lucky he didn't set up a recurring payment.  I would check the website to see if there is a tool to remove the account info from the list of payment options. There has to be a way to edit the list so that if you change banks you can update the information, yet not keep the old accounts on the list. Talk to customer service if the website doesn't have a way of removing the account. Tell them that you have to edit the account information. And give them your info. If they balk at the change tell them that they could be committing fraud if the money is pulled from an unauthorized account.