There was this scammer that called everyday and always left a really long message trying to sound like they needed to talk about some investment account that I had. It was a company I never heard of. I got tired of them leaving long messages so one day I picked up the phone and without saying anything I placed the phone on the counter, left it there and went about my business. Came back several minutes later and there was no one on the line. To my surprise they never called me back again.