I keep getting a call from this number about Air Duct cleaning and I am on a do-not-call list. How can I stop it?

Duct cleaning again, 9 am 22 Dec and this is not the first call.  Even though this is a local number, caller is very much foreign!!!!!

whomever is behind this is very annoying, no matter what you say they keep calling ....... so I decided to make an appt. Suppose to be here today so we will see. I want a plate number and some info to have this harassment looked into. I'm not getting any cleaning done, just wasting their time like they are mine. Make an appt and see who calls you back a short time later for confirmation. Want to see if its the same as what I got then will know the real company behind this.

Receive calls twice a day from this duct cleaning service. Ask them to never call again and 10 minutes later the phone is ringing again. They say they have never called before. Have even had calls where they ask specifically for me and when I answer they hang up.These people become quite belligerant when you confront them on the phone. This is due to the fact you can not do anything about them calling and they know it.