When they as for Mr.??? I always say "Yeah I'll just get him"
then put the phone down and just get on with my life.
Come back in 10 - 15 minutes and they have hung up.
Just do this a couple of times and they stop ringing.
Since doing this I havent had a call in months and I'm not on the register.
I think if you get a name as a time waster they put you on their own do not call register.

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I dream of a world where idiots are hunted like wild pigs.