Unjustified charges for 4 months

Hello.

First, sign in to your AWS account as the root user.
Root users can sign in by following the steps in the document below.
Use your email address to sign in as the root user.
https://docs.aws.amazon.com/signin/latest/userguide/introduction-to-root-user-sign-in-tutorial.html

If you do not know the root user password, please reset it.
https://docs.aws.amazon.com/IAM/latest/UserGuide/reset-root-password.html

Once you are able to sign in, please delete the AWS services that are generating charges.
You can check the services for which you are billed from your bill by following the steps in the document below.
https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/getting-viewing-bill.html

If you are experiencing unexpected AWS charges, please contact AWS Support by opening a case under "Account and billing".
Inquiries under "Account and billing" can be made free of charge.
https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/checklistforunwantedcharges.html

For questions about your AWS bills or to appeal your charges, contact AWS Support to address your inquiries immediately. To get help, see Getting help with your bills and payments. To understand your bills page contents, see Using the Bills page to understand your monthly charges and invoice.

If you are unable to sign in as a root user even after resetting your password, please contact AWS from the URL below and they may be able to help you.
https://support.aws.amazon.com/#/contacts/aws-account-support/