turn off answer's comment ?

Hi

I have 2 questions here :

1: I set the comment off for the "answer" node type, but there is still comment showing in the answer area.
My question is where this "comment" come from ? Can I turn the comment off for the answers ?

2: once there is a comment has been inputed for a answer, the "comment" link not showing anymore for the first comment, if user want to continute comment for the first comment , he need to find out there is a tiny chat icon showing in front of the comment, and its only showing when the mouse hover on it. this is very diffcult to use for user, no one can find out this. please advise how can change this and continute to show the "comment" link for the second level answers.

Thank you