contact information for Sallie Mae

It is so difficult to find any contact information for Sallie Mae. I just learned that they changed their name. While I was still in school, they reported that I was 90 days late on my credit for four times. Once I was able to contact them, I told them that I can’t pay their required minimum fee but I can pay them with a lesser amount. They refused. They are terrible at helping low income students to pay their loans.