If there is someone that can guide me in the right direction, I could really use it...

I am short selling a home that is included in a bankruptcy.  The first lien holder, Homeward did counter, and the buyer did increase the purchase price.  Homeward has now informed me that the MI company, Radian must net 162K in order to proceed.  We are approximately 28K apart.  I requested Homeward send a request to Radian to justify the requirement, but was told that whatever the MI company want they do for them since they have "delegated authority over the investor and lender.  I would like to make one last effort to help the MI company understand that our clients are not oblgated to pay the debt, as the home was surrendered.  Is there anyone who can give me information on Radian?  They will not speak to our firm, as they only deal with the lender.  Any advise helps, or I may just have to shut this down.