client would of received all the notices, and posting, and should of contacted the lender to advise them that
a modification was in progress. They could try contacting a attorney to see if something wasn't processed
correctly. I have heard of reversals, but rare.
If he wants to pursue something, take what he has in writing, get an attorney who specializes in this area to give him a free initial consult, and see where that leads him. My guess is that will be nowhere.