Help Eliminate an IRS Issue

The IRS disallowed my legitimate business deduction several years ago for space at a trade shot to help grow my business.  I tried proving that it was a legitimate expense, but they refused to listen. 

The debt has grown to $11,000 and they have now turned it over to a collection agency. I have limited time to pay this debt and they have a lien on my home. 

PLEASE HELP ASAP ... I can not lose my home.