You know what? It wouldn't surprise me if these people have hacked the Do Not Call list, and they are using it as their own call list. I get at least two calls a day from their robodialers. You have to ignore the calls or they will keep calling and calling.
What intrigues me is that if you have someone who says they have zero interest, why would you want to continue wasting your sales people's time by speaking to these same people over and over?
Yup I agree calls come on my cell, so number comes up and I just silence ring then never answer. I also agree the handy dandy "Do Not Call" does not work. Who is getting paid for that???