You cannot even talk to the other team in any pvp mode so unless you were using a third party tool (which makes your original post sound really odd since you are not supposed to be seeing that chat anyway) it might be that they were not even talking to you at all.

If you were using a third party tool well... -cough-

Also, if you were, do you think that the enemy player knew you had the third party tool and could hear them? If not, that is kind of an odd thing to say to someone who you know could likely not hear you.