This is what happens when you direct link. Ie FB ad - conversion. Instead you want a showy FB ad that takes them to a landing page that looks like your websit

This is what happens when you direct link. Ie FB ad - conversion. Instead you want a showy FB ad that takes them to a landing page that looks like your website (native) to build trust, maybe have them answer some questions to get qualified etc. There's numerous ways to filter out "bad traffic".