In order to request a refund from AdWords based on the data on suspicious and fraudulent ad clicks, you have to fill in their click quality form available here to request an investigation on their end.

The form requires a click log to be submitted. You can easily obtain the data from ClickGUARD by logging in and visiting Click Reports, Clicks. There you can filter out the time period for which you're requesting a refund, include suspicious and/or fraudulent clicks and apply any other filters and then click on the green download icon to get the CSV file you can submit with the form.

Alternatively, you can setup a click quality report email within your ClickGUARD Settings and use the information provided to easily fill out the form and attach the log being sent with the report.

Important: Per Google AdWords guidelines you can request a click quality investigation once in every 60 days.