Great. I am getting calls from one company every day twice. I called them and asked them to stop calling. They said sure done. But the calls have not stopped. I am inspired by your post.
I used to have this same problem. I'd get called twice a day by the same company, and if I picked up, they would just hang up the phone. Eventually I got tired of this so when I picked up one of their calls, I opened with "Hi, PizzaPizza here, may I take your order please?"
After that they never called again.