Square is, among other things, a service for processing credit cards, meant for businesses or other people/organizations needing to process payments. Square is not a credit card. I don't know what steps you've taken to advise you on what to do next. There aren't any fees or contracts, so you haven't committed to anything you can't get out of. If you've gotten to the point that you can log in to the Square Dashboard, you can visit this page to deactivate your account.https://squareup.com/help/us/en/article/3819-deactivate-your-account