This is a common problem with backlink packets.
What happens is that you’re directed to a “high PR” site on the knowledge that you can build links from there.
You haven’t been conned (too much). The site, in all likelihood, really is a high PR site. However, the page, profile, or blog that you only recently set up is going to have a PR of 0, because it is new, has no authority, and no backlinks pointing to it.
Therefore, you’ve just paid potentially hundreds of pounds/dollars for little to no SEO benefit!