I received a collection letter from GC Services (a collection agency) requesting payment to them for a debt I owe to American Express. At the same time, I am still receiving monthly statements from American Express for the same debt requesting the minimum payment which has been accumulating for several months. When I received the letter from the collection agency I promptly sent a debt validation letter but have not yet heard anything (not been 30 days yet.) I wonder how American Express and GC Services can both ask for payment? Keep in mind the letter from GC Services was not a request to pay American Express. GC Services wants me to send them the money.