Facebook — Promoting fake companies / fooling innocent people

Hi,
I just ordered something knowing that it is published as a sponsored advertisement on Facebook.
Its so obvious a person will feel that the sponsored advt on such a reputed social networking site must be genuine.

Along with that Razorpay ( payment gateway) makes us feel confident before purchasing.

But, most of the advt. On facefook are fake and people are getting looted.

Please have a look and the querries and comments that prepaid orders not yet delivered.

https://electronics-mart360.myshopify.com/products/all-in-one-laser-printer-wire...⇄

https://www.shoppingvala.com/

These were the 2 sites I found today on Facebook that were sponsored .

Both of them got so many orders and people are complaining of not getting the products getting delivered to them.

Who is responsible?
The Facebook? The Payment gateway? Or company ? Or the consumer?

Why not Facebook mandates the legal documents before sponsoring??

It's a shame that such big companies like Facebook and Razorpay are fooling innocent people by promoting fake companies.