Asking regarding ad

So, I acquired an advert in my Instagram feed relating to a crypto buying and selling firm. It appear authentic like there 1k+ followers and constructive assessment. Its initially ask us to offer them investment and they'll return us significantly larger than principle quantity like approach much. Like its lowest package deal is of 850 rs if I invest 850 rs by way of their buying and selling firm they'll present me with profit or refund. But i'm so confused