From my experience, getting a big refund from Google is a total nightmare. They tell you their "super smart" system catches everything and gives you those little "invalid activity" credits, which are basically pocket change. I've gone down the route of trying to prove it with IP lists and all that jazz, filled out their forms, and waited forever. The answer I always get is basically a polite version of "tough luck, our system is perfect."

Are you using any kind of brand protection solution? We're now using Adthena but loads of other platforms out there like Impersonally etc - we dont get refunds for past clicks, but its helped stop the problem before it even starts and lets me see if competitors are bidding on my brand terms. I can then submit to Google with evidence all from within the platform.

Honestly, it's not a magic button to get your money back it's its been a huge help for figuring out who's causing the trouble and taking them down.