nopStation

Download the Bulk Delete Customers Plugin from our store https://nop-station.com/customer/downloadableproducts
Upload the NopStation.BulkDeleteCustomers zip file using the "Upload plugin or theme" button
Go to Administration, reload the 'list of plugins'. Install 'Nop-Station Core' Plugin first and then install 'Nop-Station Bulk Delete Customers'
To make the plugins functional, restart the application
Enable the plugin with 'Edit' option and Configure it

Go to the Customer list page in the admin area. You will get the Delete (selected) button on top right
Search for customers by applying filters as per your required search criteria.
Select customers from the search result in the grid
Click on the Delete button, selected customers will get deleted.

The great power comes with great responsibility!
As in the most desired cases, you would want to delete the junk customers with the help of this plugin, search customers by applying appropriate filters carefully.
In case you accidentally delete your potential customers that you actually don't want to delete, you will require help from database experts to restore the accidentally deleted customers.

Bulk Delete Customer