Which body in US to resolve issues between customer and vendor?

Where can I report the vendor who didn't provide the services?
In the US?

FCC?

Thnx

 

http://ftc.gov/ and the vendor's State Attorney General.

 

Dead body.

 

You can also talk to the BBB - Better Business Bereau. They aren't a government entity. But if they are a legit business they will care about their BBB ranking.