I bought something from a well known store in the USA and it's faulty. I've emailed them twice about the problem and they're just ignoring me. At this point I usually go and complain in person but that's obviously not an option, so I want to send an email threatening to dob them into the appropriate government agency. Obviously I have to have my facts straight or I won't scare them into fixing the problem. From what I can tell, the US government department for consumer complaints is the Federal Trade Commission. Is this correct, or is there a govt department with bigget teeth ?