They called once and hung up before I could answer. I called them back and they said they were Reward Redemption Center in Phoenix, AZ. I immediately asked for a supervisor and got hung up on. After calling them back 10 times (and getting East Indian accents from each person), asking for the same supervisor, and getting hung up on, I finally got someone to transfer me to the floor manager. I asked what companies they represented and he wouldn't tell me. The manager told me that he would personally add my number to the do not call list, even though I had already previously requested that it be done. It remains to be seen if it will work or not.