Is an SEO company worth the money for a computer repair business?

[z3ro]

Please only respond if you have experience in this matter.

I own a small computer repair business in a Dallas area suburb. I have seen fast, noticeable results with my Google rankings from my new SEO campaign. But so far, I have not seen any results in call volume. We are, for now, only using key words that correspond to my suburb. Soon, we will spread to other neighboring suburbs and then eventually to Dallas.

My company is already among the top two results in the first page for computer repair, virus removal, and laptop removal for my suburb. But still no phone calls. Should I be patient and wait for the SEO campaign to spread? Or should I back out now? It's costing me 800. a month. About to begin the third month.