How to protect your site from scammers who show your site by replacing the payment page on your site?

Question

Phishing

How to protect your site from scammers who show your site on theirs, replacing the payment page and luring you with big discounts?

Dedicated server. Site on Bitrix (old).

Who can come across, I don’t really know what to do, where to complain, or where to read something?
The domain registrar is not responding. They change hosting quickly, you don't have time to ban.

Answer 1

This is called phishing.
There is only one method of struggle so far - to complain to domain registrars and hosters.

Answer 2

You can try this
iframe
filtration-ip