big vs small

So I am in one of those predicaments. where a large company is beating up a small guy. This is not a case of getting  something for free or trying to get out of a bill.  This is a situation where a quote was given and verification of what the big company was going to do and what I was going to pay for this.But now instead they are saying oh no we did something else entirely and by the way here is your bill which is more than double !! and by the way if you do not pay we are going to sue you and charge you interest and legal fees so fuck you!!! is there no one in this country, no government agency,  oversight committee that can help or cares about a small company?

what am I to do, well I can not due much,  even after talking to a number of people I know in that industry (which by the way this is government regulated shipping industry) there is nothing i can do. This system sucks so anyone that wants to know more or thinks they can help let me know. What can i do take an ad out in the local paper... big deal.  I guess the only recourse is to tell people what happened and hope they do not use them.

getting fucked by the system that is for sure.