Called me several times in one day. Didn't answer and they didn't leave a message. I have an Express card and someone else mentioned them, so it is likely they are affiliated.
303 255 5028 = World Financial Networks Nations Bank.
Apparently a bottom feeder. I think the best way to handle them is to send a written complaint to the headquarters of the company with which you are actually doing business, one for everytime WFNNB calls.