An Google AdWords Help thread has one company who feels he was scammed by a Google "subcontractor." His first mistake is not being knowledgeable enough about who he hired. Google does not have "subcontractors" but they do have certified AdWords professionals.
So if you do feel you were done wrong by a certified AdWords professional, you can report them. That is, if they are really an AdWords professional. First make sure they are a a certified professional. If they are, there is a "Report a complaint about this partner" link on their hosted Google page.
Side note: Interesting they call them "partners" here.
Once you click on that link, you are taken to this form, which you can fill out. Google should then review the complaint and take any necessary action they deem appropriate.
Forum discussion at Google AdWords Help.