SHUT DOWN AWS ACCOUNT - Cannot figure out what I am being charged for - Please help?

Hello.

You can cancel your AWS account by following the steps in the document below.
https://docs.aws.amazon.com/accounts/latest/reference/manage-acct-closing.html

For billing inquiries, I recommend that you open a case with AWS Support under "Account and billing".
AWS re:Post allows us to provide advice regarding questions, but we cannot provide refunds.
https://docs.aws.amazon.com/awssupport/latest/user/case-management.html