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Midland can be a PITA.. I had them on my reports, but after a lot of persistence, I was able to get them to delete the TL... it did take me 6 months though..
Make sure that Midland can prove they actually own the debt..
Write a goodwill letter to Nelnet, tell them your situation. Maybe you have foreberance left, maybe there are other options, or if nothing else maybe the goodwill letter will work by itself. Give that a try, getting just a few of those lates knocked off will really help you.