Billing management

I understand your concern about seeing charges for Simple Storage Service (S3) even after removing your buckets. This situation is not uncommon, and there are a few things to consider:

1. Billing cycles: The charges you see might be from the previous billing period when your buckets were still active. AWS bills are typically generated at the end of each month, so you may see charges for services used earlier in the month even if you've since removed them.

2. Data transfer costs: Even if you've deleted your S3 buckets, you might still see charges for data transfer. These costs can occur when data is transferred out of S3 to the internet or between AWS regions.

3. Delayed updates: Sometimes, there can be a delay in updating the billing information in the AWS Billing and Cost Management console. It may take a day or two for the changes to reflect accurately.

To address this issue and ensure you're not incurring unwanted charges, you can take the following steps:

1. Double-check all AWS regions: Make sure you've removed all S3 buckets and related resources across all AWS regions, not just your primary region.

2. Review detailed billing: In the AWS Billing and Cost Management console, go to the "Bills" section and expand the details for S3. This will show you exactly what you're being charged for and in which regions.

3. Use Cost Explorer: This tool can provide a more detailed breakdown of your costs over time, helping you identify when and where charges occurred.

4. Check for lingering resources: Sometimes, related resources like snapshots or backups can continue to incur charges even after the main resource is deleted.

5. Contact AWS Support: If you've verified that you have no active resources but are still seeing unexpected charges, it's advisable to contact AWS Support. They can provide a detailed explanation of the charges and help resolve any discrepancies.

Remember, it's crucial to monitor your AWS account regularly, especially after the free tier period ends, to avoid unexpected charges. If you're certain that you're not using any AWS services and want to prevent future charges, you might consider closing your AWS account entirely.

If you need further assistance, don't hesitate to reach out to AWS Support directly for a more detailed review of your account and billing situation.

Sources
Avoiding unexpected charges after Free Tier - AWS Billing
Reviewing your bills and usage - AWS Cost Management
I have no services running in Free Tier and my bills keep raising | AWS re:Post
Active services in Free Tier | AWS re:Post