calls two or three times a day with no one on the other end

I've been getting calls from this number and there's no one at the other end. Please stop calling me. I'm on a "NO CALL" registry, but it seems they're not doing their job. If you're a debt collector please be advised I don't owe any debts. I will turn this over to my attorney if this continues. This is a harrassment call and you can be prosecuted.

Unwanted call. On no call list. No one there when answered.