We are going through the same thing. We lost our business back in Sept 2009 our income was cut in half. We applyed for the HAMP modificaton (gov mod). We prequalified for the modifiction and had a very low payment (less than $1000.00 a month). That was 8 months ago. We were kicked out of the program because they said that we did not update our information as they requested (house then went into foreclosure). Well lucky for us I had keeped all of our records for when I had faxed everthing and I opened a claim for them to look at my account. Now they say we were accepted into the program but our new payment is $600.00 more than the estmated payment that I have been paying. So because I have not been making my whole payment they tacked on all of the late charges along with the difference in payments I was making for a total of $17,774.00. I know that they would tack on the difference of payments but not the late fees for the last year. So if they start foreclosure procedings (like they did on us) and can show that they have out of pocket charges they will tack it on to your balance. I call them twice a week for updates and it was still a mess for the last 8 mo. Don't give up on the modification, too may people do and there is help out there. Even though we did get the modification I still don't think we will be able to pay the new payment so I will be calling them to see what else they can do for us.
Good luck!!
Good luck!!