Called my cell and didn't leave a message.
I just put them in my phone directory as "Z Nuisance" (I set it with a Z so it's at the end of my list and I don't have to scroll through it) then I set it to no answer. That's the last I'll hear from them. Done and Done.
I received a call from this number several times over the last 1-2 months. I don't pick up and the caller doesn't leave a message. Besides being annoying, my number is listed on the "do not call list" and I shouldn't be harassed like this.