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Have you tried to do a multi step form?
Have you tried to fire the conversion only for meaningful names/likely valid names/phone numbers? I do understand you cannot upload qualified, but can you run the name/email through a filter and fire the offline conversion if it seems legit? Also, you can revoke offline conversions.. so if something slips through the automation but not a real person, you can upload the gclid/gbraid and revoke that conversion.
What about the domains where your ad appeared? Is there any pattern there? Have you tried to auto exclude domains like .io and etc weird formats?
