The billing history[2] does however correctly show the billed amounts in September 2024. To be on the safe side, I disabled auto-recharge. Losing the credit grants is clown-like behavior on part of OpenAI. Moreover, don't bother posting anything to r/OpenAI because critical posts and comments are getting auto-deleted there.
[1] https://platform.openai.com/organization/usage
[2] https://platform.openai.com/settings/organization/billing/history