After you file

I filed Jan. 31 2019.  Transposed some numbers, so a review was being done.   They then came back and said that they had it on file that I was married.   I divorced in 2012.   Had to send proof of head of household, proof that I could claim my children, and now received a letter stating that they received my documents and please give them til January 2, 2020 to respond.   This is ridiculous.