I got a call today from Intellirisk. My American Express account has been turned over to them. The collector was very persistent and kept saying that he was going to note my file that I was refusing to pay (more like can't pay, but he obviously doesn't care!). Anyway, I asked for his address so that I could send a CD letter, and after I asked persistently several times, he gave me a fax number, but no address. Should I fax a CD or should I wait and see if I get a notice in the mail from them with an address?