There are many companies out there that make claims and promises to get you on the first page of Google, or to get you in the top 3 spots on Google. I’ve even seen such far out claims as a guarantee of the number one position!
The truth is, nobody can guarantee that. If someone promises you that, turn around and walk away…no, run away! Trying to find a short cut to better rankings on Google or any other search engine could cost you business and a lot of money. We’re not talking about a few bucks here, it could cost you thousands, tens of thousands, or even more to get bad SEO issues cleaned up.
Here’s a great article from Sucuri that talks about the risks of hiring a bad SEO company.
https://blog.sucuri.net/2016/01/hiring-the-wrong-seo-company.html