Every phone company should have an option to be PUT ON THE DO NOT CALL LIST. however. I work at a call center sort of like this and i know from our training that unless the person says the exact words: PUT ME ON YOUR DO NOT CALL LIST. The calls will more than likely continue.
Using phrases like: remove my number. stop calling me. Put me on your no call list. etc. wont work.
you have to say verbatim PUT ME ON YOUR DO NOT CALL LIST.
that should help. every company has one unless it is a collections agency.