Can this be true about SEO specially on Google Search?

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well, there is a local SEO company, well known and trusted in my city that says " They can get my site to be on first page of Google search" I choose 3 keyboards and if someone search this keyboards on google my website will show on first page of Google. They says it will stay for a couple of weeks and after that it depends to the quality of your website and it may go down or stay forever.

They charge $150 for this service. But, they do not need to access my website setting to change the links or meta tags or anything. The only thing they want from me is my website address and the keyboards I want and I have to give them 30 days delivery time.

How this is possible and how they can do this when they DONT even log in into my website administration.

Any thoughts that how this could be done in 30 days without changing anything on my side such as meta tags and .......???