Nationstar Mortgage Error Prone, abusive and illegal collections Lewisville Texas

Nationstar took over a b of a note of mine in May, and has forced insurance on the house despite having been provided proof of coverage many times. They still think i owe for the time they had it under insurance even though they have the records showing its been continuously covered. They are also billing me for an escrow payment that the loan does not require. They have applied my timely payments to the un needed forced insurance, and so are harrassing me for the money i do not owe, and reporting the note late causing my credit score to go down from well over 800 to 715. I have 15 other notes with no late payment ever. It seems i need an FCRA lawyer to sue for my damages and get this straight as trying to do it by phone with their staff has not worked.