In the site, they tell you to call their support number: 1-206-577-1364
But this number is not available. And it seems like it isn't available for months at list, from searching the internet:
https://twitter.com/opethftw/status/1429019949377507329 (Aug 21', Amazon tells him to try again. This doesn't work)
https://www.reddit.com/r/amazonprime/comments/nzlqpl/customer_service_numbers_dont_work/ (Jun 21')
You might find yourself locked out of an account draining your bank, with no one helping you.