Asking regarding ad

So, I received an advert in my Instagram feed relating to a crypto trading firm. It appear authentic like there 1k+ followers and constructive evaluation. Its initially ask us to offer them funding and they'll return us considerably larger than precept amount like approach much. Like its lowest package deal is of 850 rs if I invest 850 rs by way of their buying and selling company they'll provide me with revenue or refund. But i'm so confused