After you file

Hi, thanks for helping! However, I did not receive a letter from IRS. I called because it's been since Feburay 12th when I filed. after a month of trying to reach a live agent I finally got someone and she told me it was sent out. She told me what was needed and said to send the information and write a note on the cover page that I never received the letter. The fax number she gave me is incorrect and I'm not having any luck trying to find out where I can send this information to. I'm so lost and frustrated at this point.