Ask HN: Any AWS billing issues known? Amazon forecast of 3 billion dollars

I received an AWS Budgets alert showing a forecasted charge of over 3 billion dollars despite not actively using AWS in the last year. The AWS support AI chat bot suggested this indicates a billing or metering error due to perfectly consistent daily costs since July 1. I have already disabled IAM roles and deleted known resources, but I am seeking advice as I have not yet received a response from human support.