As soon as you realize the error, please repay for the correct vehicle/license plate.
You can then request a refund through HONK support (support@honkmobile.com).
If you are using the app, there is an option to 'Change Vehicle' that is available for the first 30 minutes after your session starts. The app will then give the disclaimer you that you are repaying and that once you do the system will refund your purchase automatically. No need to contact us further!