I have had to deal with stuff a few times and to some degree. There is definitely an incentive on the case managers to get a win and its tedius to get them to reverse it. Lots of back and forth and often times they are not taking the whole file so you have to remind them about something from like the first correspondence. I had one where I had messed up as I did not take into account gains/losses from inheritance (inheritance is not taxed but if you get stock and then sell it you have to take the difference) but the thing is it had more losses so they owed me money. After half a dozen correspondences I paid them a small amount and aired that this was just to resolve the matter and I am still actually owed money but at some point the work im doing to get the thing recotified is less than minimum wage.