Cold Callers

It seems to me- from my limited experience- that cold callers are getting desperate. I had one the other week who bounced off my defences and lost his cool and started swearing at me- and one today who told me that if I didn't answer his questions he'd just call me back- which could be construed as a threat. I'd like to think they're getting rattier because more and more people are stonewalling them and the business model they represent is close to collapse. I hope that's the case- because it's a lousy model.