Same problem, I've had them call this morning now like eight times! Tried calling back, but no luck, just a message saying call cannot be completed as dialed! If anyone is still monitoring this, did any charges appear on your phone bill later?
I receive a call from this number every morning at 8:20AM. No one is on the line and no one answers when I call back, instead I get "Your call can not be completed as dial". I already registered it with DO NOT CALL REGISTRY, last week and since that takes a while before it's in action, the calls still come. I called my carrier and they advised me that I can get the number blocked but I would have to pay them for the service. I don't think so. Or I could buy a phone that has a block option. In any case I found out the phone number belongs to Teleport Communications Group within Brooklyn, NY whereas my number is programmed in to call every morning at 8:20AM. The address is 850 3rd Avenue
Brooklyn, NY 11232-1513 and the phone number is (718) 768-1827 but when I call it, it is always busy. I decided to buy a phone with a block option and in the meanwhile I take my phone off the hook at night and put it back after 8:20AM.