If a SEO company offers a 2 week listing on Google then be very wary. The SERP will probably only be for low competition keywords and with low competition usually comes low value. If hardly anyone is searching using these low value keywords then there is little point in getting ranked on Google for them. You need to get ranked for average competition, average value keywords. This usually takes a lot longer than 2 weeks. Maybe 3 months, maybe 6 months or maybe even a year.