yes I want to know that too, nobody knows anything about that guys, I think that is too good to be truth
Even if a company did get you first place rankings, your position could fall from there. SEO is a constant game. I have a hard time imagining that anyone would do the work required for a meaningful ranking and expected to get paid afterwards. There would be little stopping the client from simply refusing to pay or "crying poor". That problem that you face is that for every one reputable company, that can actually do what they say they can, there are probably many others that cannot. My advise would be to shop for an SEO company, the same way you shop for a good lawyer or dentist. Ask around, especially people you trust, for referrals. If you don't know anyone like that, then network around. Do beware though, there are many a hustler out there.
Never heard that someone needs money for your website to get ranking . If this is real good then Alexa is doing one of the most stupid things by supplying ranking to website in free. Better keep away from those websites and concentrate on search engines ranking as they do not ask you for money but ranks your website for your efforts
Seems like a sound kind of investment. If there are any other companies offering a similar service I hope someone posts them here.