How to stop spam leads in PMAX

I’m running a Performance Max campaign and have been struggling with an influx of spam leads. These leads claim they saw ads that state we’re offering a free trial or that we will pay them – which is completely false and not part of our ad copy or messaging.

Here’s what I’ve done so far to try and address this issue:

• Excluded All Apps: I’ve excluded every app placement to avoid low-quality traffic.
• 11k Negative Placements: Uploaded a huge list of negative placements (including sketchy websites and apps).
• Parked Domains Disabled: Ensured parked domains are off to avoid junk traffic from there.

Despite these steps, the problem persists. I’ve double-checked all my headlines, descriptions, and assets, and nowhere do we mention anything about free trials or paying people.

Pretty sure its coming from search partners which i know i cant shut off with p max but is there any thing else I can do to prevent this?

Has anyone experienced something similar? Could this be an issue with how Google is interpreting or serving my ads? Are there any additional settings or strategies I should explore?

Any insights would be greatly appreciated!