Billing regarding my vpc

There are several potential reasons why you might be charged for a VPC even if you believe you're not using it. Here are some possibilities and steps you can take:

1. Public IPv4 addresses: AWS started charging for public IPv4 addresses from February 2024. Even if you're not actively using your VPC, you may have public IP addresses allocated that are incurring charges. You should check for any unused public IPs in your account and release them if they're not needed.

2. Elastic IPs: If you have Elastic IP addresses associated with your VPC, these can incur charges even if they're not attached to any instances.

3. NAT Gateways: Check if you have any NAT Gateways that you've forgotten to delete. These can continue to incur charges even if not actively used.

4. Network interfaces: Review if you have any network interfaces or elastic network interfaces provisioned in your account. These are associated with a VPC and can result in charges.

5. Other VPC components: Even if inactive, components like Route Tables and Internet Gateways can attract charges for being maintained.

To address this issue and stop unnecessary billing:

1. Use AWS Cost Explorer to analyze your costs in detail and identify which specific VPC resources are generating charges.

2. Review your AWS account for any forgotten or unused VPC resources across all regions.

3. Delete or release any unnecessary resources like unused public IPs, Elastic IPs, NAT Gateways, or network interfaces.

4. If you're unsure about any resources, consider using AWS Trusted Advisor or reaching out to AWS Support for a more detailed analysis of your account.

5. Implement regular cost optimization strategies to review and manage your AWS resources effectively.

If you've taken these steps and still see unexpected charges, it may be worth contacting AWS Support to investigate further, as there could potentially be a billing error.
Sources
I got charged for VPC even though I did not use it yesterday. Whom to check with for this? | AWS re:Post
I am being charged for using VPC but I'm not | AWS re:Post
AWS Billing Charges - How do I stop the particular service ?? | AWS re:Post
iam not using vpc | AWS re:Post

I'd suggest you to go to Cost Explorer and see what you find there

Go to Cost Explorer

Choose Dimension as Usage Type

Select Service as VPC (Virtual Private Cloud)

Apply filter Usage Type

See, what this shows for that same time period. Next, change the filter from "Usage Type" to "API Operation" and see what are the contributors. Keep doing the same exercise by changing the filters to Region, Availability Zone, Charge Type. One or the other filter would definitely give you the lead where that charge is coming from.

Comment here if you have additional questions, happy to assist.

Abhishek