What should we do if USDA being unfair even after we wrote complaint letter to headquarter already?

They thought that they are government agency so they can do whatever they want. This has been going on since last year, they invoiced us some ridiculous amount which our company has never agreed on. Even though we have written complaint letter to headquarter, they just forward the letter back to the field office which they are the same groupie! I'm wondering what can we do now seems even though headquarter of USDA wouldn't even help. I just got a phone call from USDA saying that they will transfer this debt to collection agency or even the U.S Treasury, but they refuse to give us a written response - all they do is just phone call, they don't even do email!! Awww, so frustrated - my boss is not going to pay for this unjustified amount but I feel like I鈥檓 stuck in between, coz I will be the only one who needs to deal with the whole thing til the end, help!!!
What can I do?
Answers:
Since you are completely unable to give any useful information about the issue (what was the bill for?) you have three real choices:
1. Pay the bill.
2. Ignore the bill and deal with a collection company.
3. Hire a lawyer and challenge the validity of the debt.

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We might be able to help you if we knew a little more about what the bill is for and why you think it's excessive.