I caution these sorts of promises. I agree, organic seo takes time and comes from creating your own, unique, quality content that has keywords associated to what your company sells.
So many of these SEO experts crank out a bunch of horrible content that's jam packed with keywords related to what you do. It's only a matter of time before the search engines start wising up, if they haven't already.
The best campaign I've ever ran was building a web video series, giving tips to our clients over a series of 15, 90 second, well produces web videos. Those videos have been online (uploaded to YouTube) and they continue to push about 150 visitors a month to our site.
There are no shortcuts to high organic search rankings, content is king.