Check out all the various options for recovering admin access to your Google Workspace account at https://support.google.com/a/answer/33561?hl=en.
There are a number of options there including getting in touch with support as well as technical methods to prove to Google that you own your domain name and should be allowed to access the Workspace instance.
Hope that helps,
Ian
Try visiting the website of google admin directly and log in with your Google credentials.
@alphara Cancel the bank card might be easiest... Shrug, KAM