I was blessed when I moved here, to not have phone service, and quickly put my phone, on the "do not call" registry list when I did get one.
I didn't answer the door either unless, I had contacted someone, for an appointment.
I refused to give the sales office my cell phone number, so I would have to contact them, if I needed anything.
I got many calls from water testing people and they hung up, when my answering machine picked-up. One guy got thru, but I shot him down quickly, as he started arguing with me.
"CLICK" was my response.
Good luck, in trying to straighten out, these hunchback people.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).