I also kept receiving calls from this number and don't hear anything on other side. I hang up and get another call 15min later then again 15min later and again 30min later and yet again 50 min later. I tried calling the number back twice and its a disconnected number ! BIZZARO! Called my cell phone company and they put a "no call through" request.
If they are calling your cell phone then you can call your provider and request them to block the # from calling you. I did it yesterday and have not received anymore calls from that #. If it is your home phone, I believe you can also block that number. I don't know how to do it, but if you call your phone company they can tell you how. Good Luck. I know it is FRUSTRATING!