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What kind of rankings can you guarantee me? If they give you a firm answer, move on to a new company. you want a company that will help you understand what they are doing and why. Not someone who can spam you to the top of google, and people who guarantee rankings are generally garbagy in general.
I agree with Zinni. there are so many companies that guarantee rankings and it is impossible to do so. Ask them how they intend to do it and you can always make notes of their stratergies, come back and post what they have said and get advise that way.
The most important question to know about is if your website didn't reach to the desired results in G then will they refund the amount or will they take the money after your website achieves the desired results.
Well, first of all take a close look at the ranking of the SEO company on the net to find out how well they have been working on their own placements in the first place. And then ask about the guarantees and the time tables.
why can't you guarantee top 10 ranking. Its possible to get into top 10 with solid strategy. There are some keywords that you may not get into top 10, you can do thorough research. But def. top 10 ranking is possible.