Called several times yesterday, no response when I answered (I only gave them a couple of seconds; I'm notoriously quick on the hangup when I smell a telemarketer). After two calls I stopped picking up, but they never left a message. Called again this morning at 9:54.
This number has been calling us for months now. We don't pick up because we know its garbage, but they just don't give up. We don't have any outstanding debts that anyone should be bugging us about.