Unexpected title

Hello.

Because AWS re:Post is a community forum site, you cannot cancel charges on your AWS account.
AWS re:Post allows us to provide advice based on information shared by users.
If you encounter unexpected costs with AWS, you should contact AWS Support.
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.

Please contact AWS Support by opening a case under "Account and billing" from the URL below.
https://console.aws.amazon.com/support

I think I can give you some advice if you share your AWS bill with me.
Can you check specifically which AWS service is being billed?
https://docs.aws.amazon.com/awsaccountbilling/latest/aboutv2/getting-viewing-bill.html