When it comes to refunds, Google's policy is that you have to fill out a specific form (attached below):
Google allows the submission of this form once every two months.
Starting April 2020 Google made few updates, they only allows the Google ads account owner to submit refund claims. This is why we can not longer submit it for you automatically, however you can still use the automatic report to do that.
Download the clicks report:
After you login to your account, Go to "Tools" ---> "Refund Claims"
you will be presented with the following screen: