Wer einen AWS-Account kündigen möchte, der muss erst die darüber gebuchten Services kündigen 🙄
After taking a look at your account I see that the charges are coming from a Route53 Hosted Zone. Unlike most resources Route53 Hosted Zones remain on your account even after the account is closed. As a result you will see continual billing unless the Hosted Zone is terminated from the account.
Denn: Man kann die Hosted Zone nicht (mehr) “from the account” kündigen, wenn der Account bereits “gelöscht”(=gesperrt) ist.