Here are instructions that will help you out!
Delete your Teams free organization – Office Support
An error occurred while saving the commentAntony commented
i just went through a a 4 hour call exchange with several different departments and support people. no one knows how or does not have the ability to delete the account or data. the article is zero help and there is no support system in place to allow this to happen. we need to be able to do it ourselves since the support people cant do it for us.