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It'd be much clearer if you would have mentioned the service name. In general, you'll be charged for resources not for service.
Go to Cost Explorer -> Choose Date Range in right pane
Granularity -> Daily
Dimension -> Usage Type
Service -> <Service Name>
Note: Repeat same by changing option in Dimensions field as Cost Category and Availability zone, Charge Type one by one and see where you see charges are coming from. If you can view bills, that would have these details already, if you have already been charged.
This would show you when and what are the resources/which AZ that's happening.
If you want to setup alert, you can consider setting up AWS budgets and configure alarm on those, which would notify you, if you cross the defined usage threshold. Follow the Well Architected Lab instructions here for setting up budget alert based on your usage.
However, if you still don't figure out and think that it's not a legitimate charge, contact AWS Billing Support Team by following instructions at here.
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I'm sorry but can you elaborate on your question?