1099-R box 7 incorrect distribution code

I received a 1099-R from my TDAmeritrade and I found out that box 7 distribution code is 2 instead of 1.  I have not filed my income tax yet; so how do I correct this.  I did contract TDAmeritrade two times and both times they refused to do the correction.  They said that I have to contact tax advisor to handle that.  Well, it is my fault because when I withdrew the money, I put distribution code 2 which I did not qualify for this code; so now I want to put code 1 so that I can pay the tax that I owned.  I don't want to pay penalty later on.