I am on the do not call list.  This number calls only my cell phone, which is on the DNC list as well, and I keep getting a recorded message that says, "Do not hang up!  This is not a sales call.  The FBI has determined.." at which point I do hang up if not before.  How do I stop these calls that use up minutes and are totally intrusive??  I must have gotten 5 of these in the last month!!