One of the many numbers they use;
212-365-4761 866-884-0961
212-444-8255 866-884-0976
212-961-6945 888-749-2742
623-492-6986
623-492-7299
623-492-8974
801-945-9066
954-503-1801
954-503-1805
954-503-2919
American Express collections, they call from a large number of different numbers, just hang up otherwise they will get you to reaffirm the debt and that is trouble later.