Citimortgage sold my loan to NationStar and I had major problems. None of the payments I was making were being applied to my loan. This went on for years with promises everything would be fixed.
The main issue was they continued to report me deliquent and my credit cards all went from 5-8% rates (two of them were fixed at 5 and 6%) to 24.99%. I had to finance my second degree at college on the two fixed rate cards as they were better rates than the school loans at the time.
My interest payment went from like $200 to over $1700.
I have been in court with them for over a year now.