EC2 - Known Issue - Deleting Resources – DLT Operations Center

Solution:

In order to stop all Amazon EC2-related charges for an account, do the following in all AWS regions:
Note: Deleted, terminated, or released resources cannot be recovered.

Amazon EC2 resources fall under a few general billing categories. To stop accruing charges for EC2 resources, delete or terminate all on-demand EC2 resources in all AWS regions.

The following EC2-related resources might generate on-demand charges when used or provisioned to an account:

Instances
EBS volumes
Data transfer
Elastic IP addresses that aren't associated with an EC2 instance
Amazon Machine Images (AMIs)
Load balancers

Note: Reserved Instances are billed as a flat fee each month, according to the terms of the Reserved Instance contract you agreed to when you activated the Reserved Instance. Reserved Instances cannot be canceled, but if you have a US bank account, you can list them for sale on the Reserved Instance Marketplace.

The following EC2-related resources don't generate charges when used or provisioned to an account:

Virtual private clouds (VPCs)
Security groups
Key pairs
Elastic network interfaces (ENIs)
Auto Scaling groups

Note: Amazon Lightsail and EC2 use similar terminology, but they are separate services and are billed separately. For more information about Lightsail, see Lightsail docs.

If you continue to experience difficulties, please open a case with the TD SYNNEX Public Sector Operations Center