Only $19.99 for 400 Backlinks+5 Keywords, Could it be fake?

I recently came across an ad on Facebook offering 400 backlinks and 5 keywords for just $19.99. It seems too good to be true—could it be fake? Previously, I spent $40 on traffic, and while the sessions were decent (around 350 clicks daily), but there were no any registrations or sales at all. I’m wondering if backlinks like these actually work or if they’re just a waste of money.