After 30-40 calls to my home, someone finally had the guts to say anything. The [***] telemarketer had a thick, hasty East Indian accent and rushes through his questions. Here was the word-for-word conversation, and I suggest you follow suit (if you are so lucky to find someone who has the guts to answer the phone on their own call, it took 40 tries in my case), as I have since not had a call in the past week.
Me: Hello? (Pause 3 seconds) Hello? (Pause) Hello? ...about to hang up...
[***]: ...10 seconds later... Are you owner of house?
Me: Yes
[***]: You need duct cleaning.
Me: (Speaking very slowly and clearly). Just had it done. Ducts were cleaned last week. OK for next 10 years.
[***]: You need duct cleaning. We have special 50% off.
Me: I don't need it, I just had the ducts cleaned last week.
[***]: When you have cleaning?
Me: Last week. Don't need cleaning. Take me off your list. Stop calling. I repeat, stop calling.
[***]: Click.
I have just received a call. I said 'hello' a couple of times and then a man with a heavy accent said something about duct cleaning.
I said we did not have any and he did not answer me.
Also, we are on a 'No call' list.