Not really. They'll know who immediately delivered it to them, but then need to get that company to reveal their customer. This chain may run several companies

Not really. They'll know who immediately delivered it to them, but then need to get that company to reveal their customer. This chain may run several companies deep. I've seen a ton of these complaints come through. They're basically ignored or given a useless "that caller ID has been blocked" response just to say something was done. At the end of the day, sales wants these calls to keep flowing so they're not gonna get too hard on customers unless they're really abusing the betiejr (placing tons of no-answer or short-duration traffic).